Why am I being matched with high level people?

Hi! I've been playing lol for almost three weeks now, I'm in level 30 and I'm pretty good around people my level, but since I reached level 30 I'm only being matched with people of really REALLY high levels, like 160 or gold players. Is it because I entered ranked games or why? I miss playing against people my league :( It's not fair for me because I'm useless and getting killed all the time, nor for my team of pros that have to carry a noob that doesn't do anything but dying. Any advice? Do I have to create a new account to play with people like me? Gosh I sound like a crybaby, but I can't stand another lvl 161 Mordekaiser crushing me to dust everytime I get close to a minoin.
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