nothing wrong with being a tradesman. Take an electrician for example, you do that for a few years then decide you want to take the next step. You will know the practical aspects and how it works in real life. Thats a signifigant advantage over a kid who is learning this straight out of the textbook. College is often not taken seriously enough by the kids in the classes. a few years out working will make you value the education you're getting. Heh look at me, talking like that already. I'm only 24, got out 2 years ago...
If you dont know what you want to do, take the summer and try to find out. apply to the university(shoot high- why not?) hit the pavement and walk into various places you think would give you a good snapshot of what you are considering doing. ask to volunteer with them for a week or even a month and get a good idea of what its like. Once you have a goal, the planning for that is easy whether its at a community college or at university. dont take this the wrong way but you've had alot of free time the last year or two if you've dropped out, shouldnt you get serious and make some choices and commit to them? you owe it to yourself to at least give it a try.