During an attempt, the instinct to survive increases greatly. It's not a choice that happens because of not wanting to die, it's more like an instinct to breathe or the need to sneeze. So if you have any ambivalence about dying, if you aren't 100 percent sure you want to end it, it may be much harder to commit suicide than you think.
You seem at least slightly ambivalent to me. Slightly ambivalent people often don't get past survival instinct and that's part of the reason most suicide attempts fail.
I have no idea whether mental health professionals would be able to help you. Some people do have good experiences and get better as a result. My experiences were awful.
I think you're not ready to commit suicide and should do something to try to get better. I would be careful with mental health professionals because they never care about costs. So I would be very aware of what insurance covers, I would be very aware of what you say and the rules of where you live: if you are in a jurisdiction (or country) that doesn't cover involuntary care, you should be aware of that. For instance, if a 19 year old went to a therapist in the USA, and they used something like better health and expected to pay $500 total for some therapy sessions, and then if they said "Yep, I'm strongly considering suicide, have a plan, and could end things at any time," that 19 year old will likely get involuntarily hospitalized and may leave involuntary hospitalization with a 50,000 bill that will keep getting bigger with interest and either needs to be paid from any future wages or needs to be wiped out with bankruptcy. A bankruptcy means it's much, much harder to rent a place on your own if you are feeling better. It will make it harder to change cities if looking for a job. It will make it harder to buy a home if you wanted that.
So you may go from a situation where you were suicidal, and ambivalent and wouldn't have actually been able to ever commit suicide (since most suicides fail), to a situation where you are completely financially fucked. So just research the rules, research your insurance, and be aware that any mental health professional can involuntarily hospitalize you at any time if they feel like it's appropriate.
Regarding mental health psychotropic medications, some of them work only slightly better than a sugar pill, and sometimes people do get better with talk therapy and medication.
Often times, regular exercise (like jogging or hiking) has more of an anti-depressant effect than SSRIs, especially if you are doing ANY community activity that involves others (ie, volunteering, joining a group on meetup.com, etc). The problem is, if you are too depressed to exercise, and too depressed to do community activities (activities with others that will connect you with other people), then yeah, mental health professionals may be the next best thing.
I would also be really careful with experimental procedures, like ECT, because psychiatrists will often recommend that to the most vulnerable people when they are involuntary locked "care" and have no access to information. ECT kills brain cells and almost always causes severe long term memory impairment, and doctors always lie about this and say "sometimes" there is some memory impairment, but it "usually" comes back, and it's not true.
Honestly, if you are able to start jogging every day, take up a keto diet, and join any volunteer group (working in a homeless shelter, working at a food bank), I think you'd be better off. But the question is, are you too depressed to do these things? Because if you are, then mental health treatments may be a good option.
However, if your suicidal feelings are impulsive, and you're an impulsive person, and have the means to be impulsive, then forget everything I just said, because if there are methods near you that can be impulsively used, and you're an impulsive person, and you're a person with a low amount of natural fear, then yeah, maybe you should get help immediately.
I am also pretty biased against mental health professionals because of terrible experiences I've had. I've found that they seem nice, as long as they get paid, until you get locked up and can't leave, at which point they do whatever they want and treat you like shit. I personally regret getting treatment from mental health professionals, but then again, it's hard to know if I ended up living longer because of it. I generally feel like it was a huge waste of time and money.
Just please, unless you are imminently suicidal, and not on the fence at all, be aware of the costs involved in mental health care. Also, once you are getting mental health care, these people do not care about your financial wellness at all, they do not consider the link between financial wellness and happiness, and they sometimes take advantage of people and don't really offer a lot of value for the cost. You will never hear a mental health professional ask "How is your financial health? Do you think the benefits of doing this mental health treatment is worth the cost?"
So, yeah, you may want to start mental health treatment if you are too depressed to exercise every day, volunteer regularly, and do a keto diet. I mention the keto diet because it's anti-inflammatory and has shown some positive impact on people with mental health issues. So yeah, if you can't do those things, mental health treatment could be good, just make a budget, see what it costs, and also think about what your financial situation will look like if you don't commit suicide 10 years from now if you do get mental health treatment versus if you don't.
Ironically, I think there are a lot of people who are suicidal, but not so suicidal they would end it, and they end up wasting so much time and money on mental health professionals and drugs, some of which barely work, that in 10 years if they have a much much worse financial situation, they may actually be suicidal at that point due to financial desperation and wouldn't have been if they had just avoided mental health professionals. So just please, please budget this out, assess how suicidal and impulsive you are, and also, I'm not an expert on this, so you may want to ask others. My view on this could be completely wrong.