what should i do?

actually i am a med school 4 th yr student....i am so stressed about my studies..so i always prefer to be alone and study....when i study in class...my friends call me "nerd"..so i lost my confidence to study in class room...so i startd studying in room...if my friend ask me "what r u doing ?" and i reply "studying"...they act in a really weird way...as if i am doing something wrong....so i startd hiding that i am studying.....and i am so busy studying..hate parties...and hate back talk bitches i am always busy with myself...so every one hate ME...I study so hard..and i didnt get scholarship but who copy and cheat they got scholarship more than one time..i am so frustrated..exams coming..but my lazy best friend always drag me here and there...i really want to stop that friendship and b alone..b she never let me...life SUCKS