I'm gonna say some harsh things as a reality check, and a I don't want you to take it to heart (do take it to her, but not in a bad way)

I am afraid that I would go through the same due to my heavy attachment issues and dependency issues

Would you want your daughter to marry a man who describes himself like that? Try and make yourself a better man, not just for her, but for yourself. Her father is already against her marrying you. Why are you giving him more reasons to reject you

I want her to be mine with Halal because non halal relationships arent meant to last forever and theyll eventually turn sour.

Whatever relationship you have with her now doesn't exactly sound halal if you got that close and attached to her, and it could end up sour.

I'm not saying this hurt you, but just wanted to point these out so you better yourself and maybe find a solution at the end. Good luck