20-0 on SoloQ and the LP it gives me is miserable.

I did 10-0 my placements and I got placed to Bronze 5... okay. I went on a huge winning streak without making a single loss (still haven't lost a game) and I expected to jump off a division and get Bronze 3 but I didn't... okay. I'm still on that winning streak (20 wins out of 20 games) and the last game it gave me 19lp. How is this okay? How many wins do I have to make so that my MMR goes higher? 100? Even after all these wins I keep getting matched with Bronze 5 players with very low winrate and this is getting really annoying. How does the MMR system work?
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