Relationships

Why can't I commit to my relationship?

I've been in a relationship with a girl who was my best childhood friend for a while back then, she is the sweetest thing ever, cares about me, is very obsessed, loyal and open with me, but I can't understand why I truly can't commit to her, we started out very quickly, influenced by old feelings we had for eachother when we were pre teens, and it feels very sudden and without a buildup when I look back at it, I also feel that her mindset and mine aren't exactly in the same place, with most of our hobbies also being different, I also don't feel the chemistry and us moving forward like that, I have tried to talk to her about my feelings but I couldn't get enough strength to do it because of her obsession with me and how much it matters in her life (she she doesn't live in a healthy environment and sees me as a savior from that pain)
I want your opinions on if It would be better for me to cut it off or to just give it more time.
Why can't I commit to my relationship?
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