How do I stop being so tough on my art?

I feel i’m very hard on my art and it limits my creativity. I try very hard to get proportions exactly correct and things of that nature that it begins to limit my creativity because I tend to strive for as close to perfect as I can rather than just drawing whatever I really want to in fear of it not turning out the way I want it to. I end up resorting to the same old stuff and copying other ideas, which turn out nice, but it’s not truly creative as it’s not my own art work. How do I sort of get away from this and break that barrier to start letting my brain create what it wants and develop my own style