Do not try to make your drawings absolutely perfect
First of all there is no such thing as perfection.
Perfection and beauty are things which are absolutely subjective. This means, what’s nice to a person it can look awful to another person.
The other big lesson in life is, that you will never be able to make everyone happy and as a consequence you won’t be able to create an artwork which will be loved by everyone. And that’s absolutely ok. You need to accept that everyone is different. What you need to focus on is initially to make yourself happy by what you do.
After you have reached the point to have learned enough that you are ready to create, draw or paint on your own, set up your own standards of near-perfection and create accordingly. And always be patient with yourself. Everyone makes mistakes and has to restart or correct from time to time. Just enjoy the act of creating and everything will be alright.