Dad and me got in a HUGE fight. D: please help~!!?

ok first of all i am 15 turning 16. normal family fights do happen and i know that. but the thing is it actually started when my sister dating her boyfriend, chris. We'll he's a nice guy i have nothing against him at all. I am dating long distance, our anniversary was actually yesterday it was our 1 year and 5 month. We'll my sister and chris always had this thing of PDA they kiss every were and make out everywhere. Me, i always tell them to wait till their alone to do that stuff. because there's a time and a place for that and its NOT suppose to be in school or in public, no one wants to see that stuff. But anyways, my dad always wants me to go with them and i think he wants me to watch them to make sure they don't go too far (this is My older sister and her boyfriend!!!) and its like, i DON'T wanna see that! It puts me in pain to be honest. because i know i cant be with my boyfriend (he's turning 18) till he graduates. I wanted to get a job to get a car, get my drivers license on my own nd what not, dad said no. and its like "id rather pay for myself then have you guys pay for something that might not even last" because i know if we do break up, it'll be my money lost and not my parents. My parents don't mind me dating him at all. (besides my dad, you know the youngest he doesn't accept that hes my boyfriend -.-') anyway now that you know that summer, my dad and i just got into a huge fight (accually made me cry for 2 hours and him leave the house). He told me that we could go to the drive ins as a family with my sister him and I. i was accually happy because i could get out of the house. but no, my sister asked if chris can come. i know that id have to watch them insted of the movie and i woudlnt enjoy myself. So i told my dad i didnt wanna go. He basically yellled "why do you give me a hard time when i wanna do something with family!" well my reponce was "it isnt FAMILY if CHRIS goes!" when my dad says he invites family itake it seriously! i dont want to wtch my sister or HEAR them make out behind me! i dont wanna listen to their mushie crap. My dad basically gave up. Canceled it (even though i told him to go) and basically threatned me if i dont do more stuff around the house and such and such hed take my boyfriend away from me. the only reason why I DONT like chris and my sis, is because they constanly make fun of me and put me down and make me feel ashamed of who i am. and i dont tell my dad, what woudl he do? then id have to put up with more crap with my sister and i dont feel like that. Also my dad wouldnt respect my opionion...my dad walked in about half an hour ago from his drive after he left and we still ahvent talked...please help me!