I cant touch my main anymore..

Hello wondrous people of league. Lately I've feel like I've been suffering for I "was" an Azir main. About a couple weeks (actually more than a couple) ago I carried hard in all my games and eventually I got Mastery 7 Azir yayyy!!! But until now, I've been stripped away from my azir powers. I would make horrible mistakes such as ulting out of no where and diving into 3v1's or just not paying attention to my mana which causes me to tower dive. Whenever I see Azir, or whenever I select Azir I have to shake or choose Syndra. I feel really depressed about playing Azir now and I feel like I don't deserve to have the Mastery 7. I feel like I'm a disgrace playing with Azir. Azir used to be my baby and I would throw middle fingers (soldiers) at all my opponents. Now I'm just running around getting at least 1 kill and 7+ deaths.

That's not all even me playing the game itself is really depressing, I can't play mages anymore which is really really sad. The character I can play is renekton and no one else other than him. I feel so confined with selection when it comes to league. If anyone could give me advice or anything at all I would really really appreciate it and I would sacrifice anything just to be that Azir main that I once was.