A lifetime of failure and zero success makes that incredibly difficult.
What exactly constitutes a success and failure for you? A couple things you need to remember: 1) the people you probably consider successful failed WAY more times than you did; it's just that they kept going and you've decided to stop after, at your age, could probably be counted as a handful of "failures" and 2) there is no such thing as failure unless you literally walk away from something you're working at; "failures" are just forks in the road, not massive walls that stop you; even the Great Wall of China can be countered by either going over or around it. Nothing is impossible.
My point is that you need to stop thinking that success and failure at some binary absolutes. They aren't. They never will be. Whatever your true love is, work at it and don't think it's going to happen overnight. If you keep going, it will come. It might not be the way you thought it would work out, but it will be better than just walking away from it because the fork changed into something you didn't consider at the beginning.
That's the thing: I don't even get that far. Women are automatically repelled by me for some reason.
If I read correctly, you've refused to post your profile again and again and I'm almost CERTAIN that your profile reeks of negativity. You probably have some self-defacing lines in there, don't you? Or things like "I don't really do anything because I don't have any friends"? Even if you don't post the profile, at least post snippets from parts of it. Because, if your profile DOES say those things, there's a reason no one is messaging you. If, from reading your text, people can tell that you'd be an angry, judgemental person, why would they contact you at all? No one can help you if 1) you're not showing us what your profile says and 2) you're just being really angry and talking in absolutes that really have no bearing on reality.
I started working out four years ago with the intention that it would help me look more appealing to women. Here we are four years later...
A couple things to remember: 1) women are attracted WAY more to personalities than to physical looks; a girl I was madly interested in dated one of the ugliest dudes I've ever seen before she hooked up with me for a couple months and it was because he was a good dude who treated her right and 2) not all women are going to like a fit guy; some love skinny ass dudes and some love fat ass dudes; that's just how things are.
You want dates? Change your personality. Every one of your posts is wafting negativity all over the place and I'm of the mind that it is NOT contained to just this forum.
We really want to help you, man, but you have to want to also help yourself and it needs to start with you putting on that smile, perking up, and thinking of life as an awesome adventure that knows no bounds. People, not just women, are attracted to that.