I'm not sure if God made us the way we are or it is the result of the fall of man (I am inclined to believe the latter). However, God certainly allowed us to be what we are and He certainly has a place for us within His great plan for mankind. The only thing we need to do is trust in Him and accept His forgiveness for our sins. If you do that, there is no reason to feel guilty any more. We all are tempted with thoughts but God understands exactly what we are going through. If you find yourself looking at boys at church and maybe thinking things about them you know you shouldn't (this is something I have to battle every single Sunday), then pray a silent prayer for the boy(s) and move on with the service and your thoughts. Again, God does understand and He will honor your prayers. God loves you and is in your corner.