Wondering about LP gain and loss

Hey everyone, I just have a question about current lp gain and loss, because i dont see a real system behind it. Im currently sitting in diamond 3 with a pretty decent win rate that is about 56% without having big loss streaks so my MMR should be fine. Anyways im winning about 13-15 lp per win and lose 17-18, so I basically lose lp over time even tho i have a good winrate. It is pretty depressing to play like this and I would like to know how the system actually works or if there is something wrong with it. Thanks alot! Best regards
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