Pull-out method?

I've always been one of those girls that talked about how I'd never do pull-out method. I'm sixteen and I don't feel ready to have any children of my own. I have huge trust issues and I didn't trust that method. I like using condoms.

I guess I'm just asking for advice. Because yesterday, I let it happen. And I'm freaking out. I think he may have finished off inside of me. But I'm not sure. :|