First of all, it's normal for anyone to think they're not that good or as good as someone else/others. We're our own worst critic. However, if you want to improve, it's good to start by recognizing your weaknesses and build those up.
The best way to improve in any subject is by practicing and by taking knowledge by taking classes or by reading the books and by gaining as much knowledge as much available on internet and by some expert. There are also some of the ways to improve the photography like by reading the manual. By reading the manual you can understand about the camera. Also you will come to know about the button and their use and specification of it. Applying what you have read it will help and reduce your time to take the decision. These are the some of the ways to improve your photography.