My problem in believing

EDIT: IVE FOUND MY FAITH, I realized that the sign from God was my girlfriend and how she showed nothing but support for me trying to find my faith. Thank you all for helping me realize that I love you all, God bless. I've been struggling with my belief all my life and I'm 16.when I was young I would go to church but I just hated it. In recent years I've tried to convert back to Christianity but I always just feel sadness and dread when I try to pray.

I'm the recent months I've been dating a Catholic girl and we've been trying to get me to believe in god but my mind just rejects it. She says pray but when I do I get no response from God or I don't believe what I'm praying about. I've seen people say "it's the enemy trying to pull you away from God" why would the enemy even have power if God exist? Wouldnt that be contradictory? Well me and her are going through lent together and she said we will start doing daily quotes so I hope it will help even though I don't think so. If it's not obvious my problem is I don't believe God is real because I've never gotten a sign from him and I feel like if he is he wants me to go to hell

I'm sorry if it sounds like rambling I just need help How do I believe in god if I've never had a sign with him?