In my experience, one's 20's are not very great. But, eventually things do improve, one does get a break here and there as one ages that isn't parent-related. I did go to college and graduate (for what good it did me at the time) and still ended up in the non-jobs for 10 years; don't give up on your future yet, it is hard slogging through the crap to get to the future sometimes but often the future is worth it. I finally got the "right" college education when I was in my late-50's! And it was better than the first time around.

My stepson had a nasty time of it in his 20's also but now owns his own business and has a loving wife and 2 great kids and is the family "pillar". Keep doing the best you can and figure out exactly what you really want (a car is probably not it :-) and who you really are/want to be and your heart, mind, and work will move you in that direction and surprise you with the results. I'm not being smarmy, I've lived it and seen it happen to others over and over.