Hi. Welcome to beyond blue.
You are the same age as my daughter. She also gets 'A's. School days can be the best and worst of days. At least, base on some of the stories I hear from my kids. And compared to my days at school, social media can make it worse. And you are also growing up to be person you were meant to me. Both my kids had braces for a few years in their teen years.
Do you know what you want to do after school? And what grades you need to get there?
And the people you are want to be like in school, based on looks etc, they probably have their own insecurities as well.
Do you like sport? (My daughter, while a swimmer, otherwise does not like sport.) And if you do not, that is OK. We all cannot be the same, that would be boring?
Have you thought of speaking with the school counsellor about any of this? Or have you spoken to your parents about this? I am sure they would not be disappointed in you at all.
I used to think I was the odd one out in my family, because I was the dumb one and listened to heavy metal in the 80s, and church going, and liked computers, everything contradicted each other. But it took a conversation with my parents recently (last years) to understand how much they loved me, when I was the bottom with anxiety and depression. So chatting with someone might be beneficial, hopefully putting aside your fears.
And you said that you are not skinny. How skinny do you want to be? There is a difference in being skinny and being healthy. Do you like to walk? I do. It can be a good distraction tool when life/work gets too much and need a break. On top of that, it counts as exercise.
Lastly, my first girl friend was to the person who became my wife who I met while at Uni. And we are still going strong.
Maybe when you post again, we can focus on your strengths. I am sure they are there, but at the moment, all you can see are things that you dont like about yourself.
PS. I did not notice any spelling error in what you wrote.