Please could you give me some advice? ASAP xx

Hi, this is probably a pointless question that you wont be able to answer but hey, lets give it a go so people never take me seriously. But by that I mean never, today X and Y (two boys) one of them said that if I was to be a lawyer, Y would be much better because I'm dumb. Also the other day a girl said to me 'you are too dumb to go to uni'. When actually my reports are great and I try being kind to everyone. If you've watched Legally Blonde, when Warner is always doubting Elle, well I have that but from classmate. What should advice?? I could 'prove them wrong' but how do I do that? Thank you lots x