As an addict I know what your feeling this was me before I was addicted. Now I know you cant stop someone who really wants drugs because they will get them, I wouldn't suggest you start and you very likely will get addicted considering how you talk about drugs. Addiction is hell but I also know no one could have convinced me not to start and I knew before I would get addicted.
Using fentanyl recreationally can also lead to serious side effects, as your body may not be able to handle it. Drugs take a significant toll on your body, mind, and spirit. While I can't stop anyone from using drugs, I don't want to encourage it but I would rather you be safe so I will give you some things I would recommend for your safety.
Opioids, in particular, are dangerous because once you're addicted, stopping can lead to severe withdrawal symptoms that can be life threatening. This is why many people need to rely on treatments like methadone because withdrawal.
If you do choose to use, I recommend starting with something lighter, like a lower dose opioid. Codeine is where I would say is the safest starting point. You could go for a dilly, but that's much stronger, and I think codeine would be better overall. However, even that can cause adverse effects. Methadone could be an option since you're a non opioid user/ addict, so you have a different threshold, and it may provide a sense of euphoria.
It's important to approach this with caution, and please get a Narcan kit it's free! I also suggest having someone with you and if you can't, then have someone you can contact in case something goes wrong, so you feel safe reaching out.
Stay hydrated and avoid being in a low light or dark room. If you decide to use a harder opioid right off the bat, I suggest having plain bread or crackers nearby, along with water, and being close to an available bathroom, bucket or outside in case you start throwing up, which is likely. I also recommend wearing loose clothing or layers that you can easily take off, as you might start to overheat. If that happens, run your wrists under cold water or use an ice pack or fan.
But drug use will make you miserable I can almost guarantee that. stay safe Im sorry you feel this way.