Hello brother/sister first of all let me say to you that you are who you are, a very unique person.
You can let others doubt you but never ever doubt yourself. You may not be able to do something now or you are not just good at it but you can be good at it later through practice. Remember you learned how to speak, how to walk, how to write, how to bike and many other things. My point is that you have learned every single skill that you have today. Others may have talent but all the so called ''talent'' does is give someone a higher starting point than the other, we all have the same finish line and it doesn't matter whether we finished it first or last. All that matters is that we will eventually cross it. You see when I was a child my drawings were really ugly but I keep on practicing and practicing and when I was on grade 6 my drawing skill was eventually recognized and I was brought to a contest. Even though I didn't become the champion of said contest I was happy because my hardwork eventually paid off and that feeling was really the best. Until today I still practice my drawing skills if given the time. You must keep on moving, you can slow down but you can not stop because there is no difference between not starting and stopping in between. Here are a fewof my drawings :)). I like to draw anime characters by the way.
That's all :). Positive vibes