<human>: First time posting here guys, and I need some advice.

I recently paid off ALL credit cards that I had opened, I have an Amazon store card, LensCrafters, jcpenny, and a guitar center credit card, used it up and my now credit score is bad, around 550. Reason is, dumb teenager stuff, unnecessary spending (saw something that I wanted to have, swiped, late payments, collections, late payments again, vicious cycle) I worked a shit job and not having enough to pay every card that I used racked up interest, more debt, missing more payments, ugh!

Right now, I don't work but I go to school full time. Again, all cards are paid off, no credit card debt, no collections, they are still open but the sight of them, even the thought of using them scares me. I don't plan on opening or using them even, for student books, until I find a job. 

I have no idea how to go about fixing this, any advice? Life is starting to catch up and I'd like to be able to fix it now rather than later, I know it's late as hell but better start now.

I do have student loans but I'm a junior in university right now, yay!

How do I slowly fix my credit score? Any help is appreciated.

Thanks.

Can you condense the text into three sentences or less?
<bot>: have credit cards as a dumb teenager, excessive debt racked up. Now I'm older, 3rd year university student and all my credit card debt it paid off. How do I go about fixing it?