Matchmaking in normals post lvl 30

So I just returned to the League after looong time with new account. It was going really good, untill I reached lvl 30. All the games I get are ones with ppl with lvl 100+ and a lot of exp on their champions. Needless to say that almost all of my recent games were a misery. Winning a lane (I usually play top) against someone with 10 times more experience in-game is almost impossible. Needless to say that it is extremely difficult to have fun in such scenario. Do you know why did this happen? Is it because of the way matchmaking works?
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