i need help. idk wat to do anymore.

alright so i have been dating this boyy.. and i like him and all but i don't feel as happy with him anymore. what do i do, all he wants is sex anymore. everyday he begs me for it and i always tell him no im not ready and he gets all mad at yells when we hang out he is always on top of me i tell him to get off and he don't. i mean yea he is kinda funny but idk. i need help..do i stay with him...oh and another thing i like this junior and idk if he likes me back. do i tell him or just wait i mean we talk all the time and we do math home work together and ughh idk i need help?>!??!