Losing more lp than winning

Currently at Silver 5 elo with my mmr being well on the normal mmr for that league, yet somehow i am only gaining 17 lp per win and losing 21. I honestly belive this is becoming a little ridiculous considering how hard enough it is to climb at this rank. Now i would understand if my mmr was tanked why i should be recieve less lp for win and losing more per losee, but my mmr isnt bad so i dont understand why i am being punished for belonging in my elo. i also understand that a riot employee is most likely going to take this down rather than post a helpful answer to my problem, but never the less something needs to change about leagues ranked system, because i can promise you im not the only one that is having this issue and realizing how flawed it is. In my honest opinion i feel that the ranked system is almost unclimable with such setbacks like this. I honestly have no clue what it is about punishing you for doing well in this game, it just seems a little unfair...