I am stuck in a never ending cycle.

Disclaimer: I am French so the post might contain bad english. I always wanted to get in gamedev but everytime i am starting a project i quickly lose motivation because there i realise that there is alot of things i can't do (level design, doing good scripts etc...) and i never know where and how i can learn thoses, also everything i am making look horrible to my eyes for some reasons and i can't get rid of that feeling. It's like that for every single project i am making, gamedev or not.