When should I transition from bot games to PvP?

Hey guys, I have been doing my best to study this and I have been doing better in bot games, but I get absolutely destroyed and lose the game for my team every time I go PvP. It makes me feel like I am not ready. When do people usually transition? What's a good position to play if you're not good at all, so as to be as little of a detriment as possible>