Worry about college first, then you will have plenty of moolah to fix your hooptie with LOL.
Seriously though, concentrate on things that take time and labor.. not money. There is lots of stuff to do. Save up a little money at a time, and hold it waiting for a great deal on parts to pop up. It takes awhile, but the satisfaction of knowing that you used ever last dollar to its fullest will make up for it.
Hang in there man, its a long journey. Keep in mind, there is no perfection in cars. It is what it is. My S14 rides rough and can be difficult to street drive at times. There are days though, when I am cruising down the highway thinking this is the best car I have ever had......
Don't sit around thinking about what needs to be done, and how much it will cost. It will overwhelm you so fast its silly.
Evan