Locust, I am 43 years old and a college grad. My first 3 semesters were just pathetic. First of all I didn't have the aptitude of most of the students, being a product of the public school system. Secondly, there were a lot of bad influence people that tempted me to miss class to do other things. Starting with my 4th semester I found out there was a College Bowling team. You had to try out and make the team but also have a 2.0 avg to be eligible. That was the thing that made me buckle down. I really wanted to compete on a national level. I began going to the library after work to study until it closed at midnight. I would sit in the same booth every time so all I had to distract me was to read the new graffiti on the walls (since I had already read the old). My grades steadily improved and the better they got, the more I cared. I finished college with a B- average. That is just what motivated me.
My advice to you is find out what you are passionate about and pursue it. It may mean not going to college at all. Last I checked Bill Gates and Mark Cuban didn't graduate college and they did ok for themselves. There are so many ways to make a living. Not all require college education........and as Perna said, you can always go back.
I spent about 20 yrs in retail mgmt. I hated it. I can tell you this, after 5 years your degree means nothing. It's all about track record in your field. Finally decided to follow my passion, antiques. It's a little awkward leaving a high paying for the unknown, but I never feel like I'm working anymore. It's like a full time hobby. Now I feel like I wasted 20 years.
I hope you find the answer. I know what it's like to be depressed, unmotivated and not caring if I wake up the next morning. Good luck to you. Regards, Cajun