I don't know what to do. I am only 16 years old but i am in love

with a 19 year old. He even lives with me an my family. We have been dating for 2 years almost and my dad doesn't like him.
I have plans to marry him later on in life but i do not think that my dad would like it.
He doesn't like my boyfriend because he thinks that he is a liar and a cheat and he borrows too much money from his grandmother.
I am so involved with him that i even stress over unpaid bills. I am not willing to give him up!!!!!
Please let me know if you have any suggestions on what i should do.
Any advice would help.
Thank you!