Parents are always going to be that way around their little boy or girl. Just when you're around them, be on your best behavior and use all the manners you have. Takes a while to break the ice with parents as I'm one myself. Prove to them what a great person you are and things will work out. You'll see.
Try to take some time to get to know the parents. Things are usually easier in a relationship when the effort is made to get along.
Usually getting to know the parents is as simple as saying hi, asking them how they are doing, and being polite. When other, good conversation starters pop up take them. Act mature, don't yell, always be polite and maybe they will end up changing their mind. With some hard work and luck you will end up being the nice girl they adore.
Be careful not to do things they don't like in front of them in their home. That is usually a reciepe for them to hate you forever.
Try to give his parents as much respect and love as you can. You can make them to start liking you only by your good behavior. Just try and try and try again.
On the other hand If they don't accept you, but your boyfriend loves you enough to support you even if his parents are against. You should really not think about this matter alot. Just be with him.
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