hi ashis even i am undergoing the same situation....i keep thinking my classmates r better than me and even get discouraged....but dont worry keep concentration and keep saying to urself ''i will do it and hell with the rest''
make some goals for urself for eg:
if u hav 2 complete half chapter in 45 mins or practice about 25 problems dont relax till u finish......then after finishing treat ur self and again start studying
i am doing the same thing and i hope u get motivated