Is it my fault I never win in PVP?

I've played this game some years ago and I just got back to it recently, I'm still very new and I can't seem to be able to win a single PVP match. Should I just stick with playing vs bots? I don't understand, why is my team the one that always loses? You know, by logic, there are 2 teams and I'm in one of them, but if the one I'm in always loses, is it my fault? I try to help my team as much as I can, I like playing support like Mantra or Morgana, but It's just not very fun to keep losing for no apparent reason. I mean, yeah I'm a newbie, but so are my enemies (I think), so why am I the one losing 100% of the time?
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