On Not Being Good at Anything - And Not Improving

Figured I'd put myself out there and see if I got any advice. I've been struggling to do anything well in League. I've been playing for long enough to understand the game somewhat on a theoretical level but I completely fall apart when it comes to applying anything. I have no main champion because I'm basically equally garbage at everyone I can't improve at all. I can tell when something is my fault but I can't tell how to improve or fix it. If I'm always dying to ganks, I don't know what else to do because if I'm too careful I get zero farm and lose lane anyways. I don't know who to play or what to do
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