this is part of my plan too. i understand your reason. my death is my own.
you should know this will be very difficult and painful for your family and will force them to do a lot of work to clean up the stuff you've left behind, finances etc.
your idea is pretty weak. your own car will of course link any body that is found in the area back to you. these days with numberplate recognition and cameras everywhere they'll be able to track your movements easily. and unless you live in like siberia, anywhere near your home isn't going to be that far from areas where people frequent. if you are anywhere near your home, once you've been reported missing, they will try and find your body, probably will succeed, and if the body matches your description (sex/age/height) they'll probably know it's you even if you did something to disguise yourself (which is not very possible). especially with your abandoned car.
there's also dental records. don't think you want to pull all your own teeth out.
plan and play a long game. don't just up and leave. you want to have a plausible reason why you're away. you don't want your boss saying you've not turned up for work. quit your job but still pretend to go. say you're going on a vacation. say you've found a job in a different city. think of something like that to give you room to manoeuvre before people start searching.
if you are still very young / don't have a lot of independence/ live with your family make up some story like you met a girl online and are visiting her in another state. then go in completely the opposite direction. you will have to think something up with misleading clues. lie like crazy.
sort out your finances. pay off credit cards and loans or at least consolidate them. cancel your plans and subscriptions. leave your shit in good order.
think of your digital traces. wipe and dispose of your tech in ways that are impossible to undo. use burners. remember we are extremely traceable these days with anything online so try to do what you can to mitigate this.
get FAR AWAY. different country or at least different state. use google maps and google earth to locate somewhere with a good combination of accessible,
remote, and with few people. don't go anywhere that you have social connections or have been to before.
sell or dispose of your car before you execute your plan, and do it far away from the area you plan to disappear and ctb. how are you going to get to your spot without a car? well this is why you've spent time using google earth and maps to pick a spot that is accessible by public transport and walking. a small town surrounded by a lot of forest and wild country. small town on an ocean coast or with a lake where you can easily drown yourself. this might not exist in your country, but it will in other countries. look north.
i think going abroad is good because if the authorities there find a body they will look at missing persons within their own country to try to identify it. they won't expect you to be a foreign national. if you have no id on you and noone knows where you've travelled to, it will be very hard to identify you.
drowning as a method is also a way to be more sure your body won't be found or won't be identifiable if it is found.
get rid of your phone and all your identification far away from your final destination. i plan to mail mine back to my family.
withdraw plenty of cash before you leave, try and buy as few things as possible while you're on the move, and always use cash. don't use uber or anything else tied to your identity.
get a complete change of brand new clothes including shoes. don't wear anything that anyone would recognise as yours. no watch, no jewelry. if you do decide to travel abroad, buy clothes from stores in the country so they have less reason to suspect you're a foreign national if your body is found.
when you're travelling around, think about concealing your identity. cameras are everywhere. wear dark nondescript clothing, hood up, covid mask, sunglasses. you don't want a good cctv image of your face flashing up in a town hundreds of miles away if people are searching for you.
is this hard work and complicated and expensive? yeah. but if it's worth it to you to completely disappear then you will put in the work and not care about the cost. if actually it doesn't seem so important and worth the hassle just do it near your home. after you're dead it won't matter to you anyway.
how to make peace with dying alone? we all die alone. even if you end up an elderly person dying in hospice with your whole family around you, you're still alone in the experience of death and your actual final moments. you have to face death with no attachments. you have to be ready to die and know that once you have died none of it matters. your final moments will be completely eradicated as if they had never happened. so really it doesn't matter what they are like. death is the end. i think especially on sites like this people get overly preoccupied with their method and final moments. if you're really determined to die all that matters is having an effective method that will not fail.