I don't play as I should

Hello there. Today I'm here to express my frustration. I'm a gold 3 player ( this isn't my main account), and I'm playing like a silver.. maybe bronze. There are situations in my games when I don't even know what I'm doing, and I missclick a lot, miss skillshots, cancel my attacks, stuff like that, and I'm frustrated because I shouldn't do that, taking in that I'm gold 3, and I'm starting to believe I won't get good at this game. Can you guys help me with some advices or some stuff?