Thank you very much for help and support.
I am starting to feel that its not that dark and lonely as i used to think.
I too go late every day, teachers make comments and whole class starts laughing, i fake a smile to cover up. In middle of a class, a teacher once told me "you look & think like an alien, like you dont belong here in this class and you are here by some mistake" Councelling is compulsery for students in blacklist so i had it many times. They always ask the same question, "Why? Why do you not attend college? " , i dont have any physical reason and i dont think they will understand the psycological reason so i dont explain.
On positive side, i have a healthy body, good height and physique, helpfull nature and a lot of knowldge of about anything(thanks to internet and books), this gives me good reputation and others approach me when they need help. This leads to some amount of social interaction and they make me feel comfortable. I will go home today and celebrate birthday and new year with my family and try making things better for myself. Thanks again.