My boyfriend doesn't know me...

You sound like an utter doormat. This guy sounds safe, but you're a prime target for narcissists and other people-users. I don't know that I'd love you the same if you couldn't be honest with me about things that don't matter; to me that could only mean you'd really lie like a rug about important stuff. So maybe consider things like that when you get to feeling a little too precious about yourself.

just tell him the truth. if he loves you he'll accept you, if not - find a different man. you are worth loving for you and you shouldnt have to change to fit someones image

People always present a better view of themselves when they first start dating someone, so your probably really isn't all that unique. Its not lies, we just, you know, act like better or different versions of ourselves at first. Over time as we get comfortable in the relationship, we let our true selves show. The truth is, he has probably presented some "better" version of himself to you to, and you'll probably find out somethings about him that you were unaware of too. You don't have to start with a big confession about who you truly "are", just start being yourself. Love is built on more than just superficial preferences, so if there is something real there, you shouldn't have to worry that he's going to dump you once he realizes you think Blink-182 is like listening to a roomful of babies wailing.

Lies are a tough way to start a relationship. You need to slowly dig your way out of that, not all at once with a grand confession. He'll just wonder what else you're lying about. Tell him you occasionally like meat, then work your way up to the meat lovers pizza. Say little about cats and act indifferent when around them. You can suffer the blink thing and move away from that because musical tastes do change.