I am having a faith crisis, I need help, wanna help?

I am a sikh, my experiences in life have made me very bitter, I used to pray to Waheguru ji daily and life was beautiful but then doubts entered my mind and I gave up. Recently I decided to break free of the doubts but will Waheguru ji take me back, and what do I have to do to be taken back? The first time the doubts came when few of my prayers were not answered. I am a combat sport fighter and my fighting career suffered heavily after an injury, I wanted to go back and prayed and prayed but my parents were very negative about it and placed blocks in my way. I had prayed to Waheguru in the first place for a sport I can do and it was a godsend when I found a combat teacher close to my home. With my parent's negativeness I was left in doubt in Wahegurus ability. At school my grades suddenly dropped and I entered a depression then I got addicted to Pornography and a triade of bullying started against me at school and now I am just a wreck. Please, Please help.