How do i become more presentable? ( to look and smell so much better)?

don't get me wrong but im not a tomboy or anything but everytime i go to school i feel unclean like i need to take a shower. i mean people look at me and say mean things. i dont stink and i do take showers but i sweat a lot because i wear my jacket over my clothes because i dont want to reveal anything. and that leaves an odor that not a lot of people would think is attractive. i also do sports which is another thing. none of the boys at my school wants to go out with me. i dont know if it's my looks or my appearence or both. but i want to look and feel good all day. all the boys want the pretty popular girls. and i just stand there watching them smooch and sweet talk. i also have a problem with my hair. it is just so thick. ( im black) anyway can you guys help me with this and my wardrobe. thanks.