I have a crush on someone?! Middle school?! What is instyle?! HELP?!?

well, like...i heard that the lockers where gross and will get jammed, and like do you get a homeroom/main teacher in middle school? or like when you get to school, you just go to science, and then you go to social studies etc.? and like what is in-style? and i also have another problem, like there are alot of groups of people, the cool people, the popular people, the nerds, and the ordinaries. I fall into the cool group. well i am known as the girl that hangs out with both females and males. and i hang out with all the dudes and girls that fall into the cool group. well there is this dude that is like my best friend but i have been crushing on him for like 3 years now...what do i do?