Should I, or shouldn't I?

There's something huge to tell but i don't know where to begin with. Bav and i went out the other day and we talked a little. I ended up telling her that i have feelings for her. She said thank you for telling her. On the next day, we texted me and told me that she felt the same way. 

She knew my brain my body is so complicated and she wanted to give us a try, saying that she didn't want to regret for not giving it a try. Part of me wanted it and part of me stopping me. In some way i find myself selfish. I don't know if i'm trying to rush into a relationship simply because that i began relying on her. Should that be the feeling of affection? Do i really like her? Or i just thought she's a very nice person? I hated myself so much for not able to understand myself. At the end, i crapped something and she said she will wait for me until we grad from undergrad school. And i did all these over the phone, which was really really lame. 

She is a very decent person. She knew almost every bit of my problems and she still said yes. I feel terrible. I cannot guarantee her anything because im unsure of myself. It's me, it's all me. It sucks being me sometimes. It's just too complicated. The question now is: Should I, or shouldn't I?