What do you think about thiss??? help?

okay so my boyfriend of 20 months is 20 and i am 17 i love him a lot and so does he..but he can be to over protective and has anger problems and my sisters hate him beacause of the age difference and they think he doesnt do anything wiht his life but he will go to college in spetember,..my sisters always yell at him for being wiht me but we do love each other a lot what should i do break up with him beacuse of my sisters ?