Buzznet Agony Aunt

I'm really happy with this guy, but my aunt and uncle that I live with hate him. I'm only 16 so I can't move out or anything drastic like that, so do I make them happy, or do I keep myself happy? we've been together for 4 monthes and we are so happy together. But they say that all he wants is sex, and that he has no goals in life, and all the bad things that they can think of to try to make me break up with him.
we aren't even having sex. we are both still virgins and we BOTH plan on staying that way until we are older. I asked about birth control and my aunt said no to it. She's afraid that I'm going to get pregnant before I graduate high school, but she won't do anything to help me prevent it besides being a witch. She has no confidence in me even though she got married at 15.
My aunt even tries to get me to cheat on my boyfriend. We walk into Walmart and she starts talking about how cute "that guy's hair was," or "ooh look at his muscles."
They say they trust me, but then they tell me that we can't be alone together at all. I thought that parents/guardians are supposed to be happy as long as their kids are happy and not hurt.
They think that they are protecting me from being as stupid as they were/are, but they really are only hurting me.
I mean, I love them, because they are my family, but they are so difficult to deal with.
His family loves me. His mom says I'm the daughter she never had. His siblings from both his moms side and his dad side love me too. I don't understand how we love each other so much, and my family hates him, but his family loves me....
What do I do? who do I listen to?

Help please!!! Thank you!