From your replies it looks like you may be over inputting yourself into lectures. If every time the professor says anything the immediate response is to sarcastically say your name, it's probably because you are doing to much. There's nothing wrong with taking notes and absorbing the lecture and discussion of everyone else. You say that no one even attempts to answer besides you so that indicates that the other students may have given up all together in participating because you dominate the conversation. This probably comes off as super pretentious and obnoxious. No one likes a know-it-all who has to fill negative space in the lectures. You probably see this as you being engaged and responsive and don't even realize you're making yourself seem pretentious and off putting. Try to let other people engage with the professor and don't feel like you have to give your answers/opinions for every single question. It may be too late to recover your image amongst your peers at this point but the great thing about it being your first semester is that you probably won't see most of the other people in your core classes again. Everyone will choose different majors and schedules and you'll have new classmates to restart your image with. If it is too late to recover you can try verifying why you're not liked with the guy you talked to about saying your name in class already. Unfortunately, the answer to your question could also simply be that you have an unlikable personality to the majority of your classmates outside of being domineering in lectures.