Please--Help me?

I am so depressed. I started a new school and have made several neutral friends, but only one good friend a sweet boy that's asked me out named uh...nick?(named changed to protect the innocent,) And I'm taking an online course at school that is about 2 grades ahead of all the other children(I'm the only one in the school taking it) and I start 3 weeks late and it's hard. None of the people I call acquaintances are in my cles and I feel so awkward. Not to mention the multiple times my mom asked me if I'm smoking in school-which I detest. I can't stand the smell of cigarette smoke. How can I fit in more and be more comfortable in my surroundings?(example: Not feel like I'm going to throw up.) Thanks in advance.