After how many matches sbmm is starting to work? I played like 10 matches already and I still got matched with very good players (probably coming from CS).
After that many games you should be matched against players of similar skill, maybe you're better than you give yourself credit for?
There are other factors that go into matchmaking (like if you're in a party or your ping to our servers). We also expect things to improve as there are more people to play against.