Well clearly it isn't education you want, it's just something to do. (Though if it is, Turns pretty much summed up exactly what I would have said)
In which case, I just advise that you pick up a hobby of some sort. Getting back into academics will take effort, as will anything else, so saying that it's difficult is a moot point. However, the fact that it's difficult is a good thing. If it's difficult, it's meaningful - and worth something. You'll be satisfied in doing it.
You've been sitting around doing nothing for years, correct? Well what's easier than sitting around doing nothing? Nothing! But how far has "easy" gotten you?
So, step one, just do whatever it is you like - but actually do it. As you start something and gradually progress, you'll gain the confidence and motivation to continue. You just need to keep working towards something you actually love and enjoy.
Now, there's also the possibility that there may indeed be some real mental instability going on in which case, I would advise it being checked out. But let me tell you, that whether you have something wrong or not, or whether you're upset or depressed or giving up or whatever, you are not useless. You can make something of yourself and do something. Something huge even. A lot of the greatest minds throughout history were considered to have a few screws loose in their time. It doesn't mean there isn't any potential in you whatsoever.
You can keep coming here to let a load off your chest or get some motivation or a shoulder to cry on, of course, we'd be here to support you - but that shouldn't be the end of it. Try to fight past whatever you find difficult. If getting into college is what you really want, then damn well do it, and don't let anyone tell you that you can't, and don't let an afternoon of meeting some tool stand in your way of achieving what you want. Don't hide from the storm. Be the storm.