What has happened to my winrate?

So I played league for a while a few seasons back, got into low plat and have only really played Quinn. I've played the odd ARAM game etc but now trying to get back into the game. Obviously I'm rusty, and not going to be particularly good until I get back up to speed, but my winrate is abyssmal at the moment. It's sitting at arond 25%, and after placements I was put into Silver 1. How am I consistently losing so much? Even if its down to me being poor, surely just being carried alone would give you a higher winrate than that? Anybody else experiencing this or just me?
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