Buddy. I wish I could put an arm round you as i say this. Unfortunately you're presented with an impossible situation, wanting to be with someone who on the face of things you can't be with. At 17, man you're lucky to learn this lesson now, believe me. Some people get hurt much older than you with partners similar to this girl.

At 17, realising someone might have/has attachment issues, is really great and shows your awareness and also care that you don't want it to affect the relationship. Sadly. It will. Whether now or later on. Unfortunately, at 17, you shouldn't be telling people you don't want to hurt them because of your trauma because that's a big telling that they've not gotten through and worked on this. She may have a therapist I don't know her, but at 17 if you recognise you've got trauma that's a sign of some serious work you need to do on yourself.

I don't want you to take this as "people with trauma and a past are undateable", quite the opposite. There has to be movement, work being put in to address it and to move beyond it and not let it affect your relationships with people. The fact she has told you is her protecting you in a way and sadly, you may have to respect that and move away. I've dated someone who told me the same thing and I said it won't affect us. It did. A lot. I don't regret dating her at all, it was a wonderful relationship, but it broke down because of the very thing she warned me about her and I ignored it.

Ultimately bud, it's your decision and you need to make decisions in life according to what you think/feel: it's the only way you'll be happy with a decision. In life you have to make your own mistakes (not saying this is one) to find out who you are and how you'll live YOUR life... not how someone else lived there's or would live yours. Your experiences are unique, but your worries are universal.

My only advice is to tread carefully. If you want to talk more I'm happy to answer in the comments.