How to stop comparing yourself to other people?

Have you already done GCSE maths? If not, keep working at it. I failed a past paper in class (D), the teacher mocked me for deciding to choose Further Maths for A Level... but I got an A* in GCSE maths (and proceeded to get A* in A Level Maths and Further Maths)

Have you already done GCSE maths? If not, keep working at it. I failed a past paper in class (D), the teacher mocked me for deciding to choose Further Maths for A Level... but I got an A* in GCSE maths (and proceeded to get A* in A Level Maths and Further Maths)

My friends are extremely bright with lots of a* for target grades. My target grades are all A's an one B. One of the only subjects I can naturally do is maths, I really like it and I want to take it for a level. The teacher told us not to revise for the two tests and I didn't so I got 55/100 which was a B on one of them and similar on the other one (haven't got it back yet though due to being ill). My friend used to suck at maths and she hated it (still does) but her mum paid for her to have private maths intuition and she got an A on the one I got a B on and an A* on the second one with 93/100. This makes me feel so bad and she keeps going on about how happy she is and how she beat the boffins and I'm happy for her. But maths was the only thing that made me feel bright enough to be at a grammar school because I could do it well and with enthusiasm and I did so badly in the test. It means so much to me because now I feel stupid and worthless. How can I stop comparing myself to other people?