I feel like Chirstianity has derailed my life.

So I am a 15 year old Christian who around six months ago realized my life is very consumed by sin. I wanted to get my relationship with God better, so I began praying more and began trying to overcome sin. However I have found that I have made so many things that I was unaware were sinful become a habit/addiction, therefore it feels like every time I do fall back on sin and pray to the Lord for forgiveness, I don't feel redeemed, or better, and all I really feel is that I failed again and I feel less confident in myself and more hopeless. I fear I have damaged my relationship with God beyond repair, because I am simply too sinful of an individual to break out of this loop, but I also can't stop myself from coming back to God, trying again, failing again, and just becoming less and less confident as this cycle repeats. I feel very stuck and helpless and am looking for guidance. Thanks