Well if people say your art isnt good then that's just mean. It would probably be beter to say its not very realistic, but thats not necessarily a bad thing. Personally I think its very cute, and I am saying that not only because I want u to feel better about ur art but also because I really think its cute! My sister agreed too! Now, idk if you're going for a cute look or a more realistic look or just overall better, listening to the haters really slows you down! Practice, or draw, as much as possible (whenever you feel like it) look up drawing tutorials if you want to, even copy someone's style (as long as you dont claim it to be yours and give credit)! These are a few things that will help you improve faster. However, honestly just do what you feel like in terms of drawing and you will improve, as long as you believe in yourself, as cheesy as it sounds. :D

Lol!!! I start writing these things and then more and more thoughts come to mind xD sorry its so long

Oo yes I get what you mean!! And you can achieve it!