I would not sweat the bike.... talk to the Financial Aid Office... they can possibly help you work around the tuition expenses.

If you have the aptitude and desire to attend college, you can find a means to pay.
There are a ton of grants available also... don't give up yet... go talk to them.

Good Luck.

Foot Note:
When you graduate from college and have a professional job, you won't need anyone to cosign for you any longer