Am i stupid???

At skool when mother tongue class,FARIS scould me like he is so smart...
The story goes like this...
We were doing a group work...I do it myself cause i want to test if i can do it or not...So,the others is SMARTER than me...They have the same answer but my is diffrent...Mr Naguib called me n some others to represent thier group...Mr Naguib even told us to bring our own paper...After i finish writing,Mr Naguib go through,when others get correct i get wrong FARSI was angry with me...I was sad cause the way he scold me was i am REALI STUPID...I was angry n sad...