How to boost ratings ?!

Hi , is there any way to boost the ratings ? I have played around 50 games and I am 1900 ( won every game, just 1 draw). But then I saw  guys who have already more than 2200 with less than 30 games(  and those guys had no title).

So my question is how is this possible and do titled players already have a higher  start rating than others ?

Thx for your help, Till_98

I checked your recent games and there are lots of wins against 1500-1600 players but those wins give you very small rating increase because you are >1900. Try to choose opponents with rating like yours or higher.

Okay I will try but isnt the opponent randomly chosen by chess.com ?

change the settings so you'll have 1900+ opponents 

here is how to do it

Thank you !