MorningStarr, I think you should tell your parents soon if you want to do this. Give them time to get used to the idea before you move. Some parents could take longer than others to get used to the idea than others, you'll just have to judge that based on how well you know your parents.
What EquiPro said does have relevance, IMHO. From personal experience, after moving cross-country from Utah to Massachusetts to live with my husband (I moved here a month after we were married), I know very well how this sort of situation goes. I wish I would have known then what I know now. If I did, things would have been much different.
Don't get me wrong, it's fine to move away from home to live with a significant other. When you do, just don't let your boyfriend become your only source of support--whether it be financially or emotionally. I know it sounds almost elementary, but it is important. Line up a job before you move there if you can, or get one asap, and get involved in things that interest you like, like church groups, volunteering, politics, school, meeting/chatting with your neighbors, etc. It helps to be able to pay for your own end of the bargain, like your half of the rent, utilities, your bills, etc. It also helps because you're able to make friends. Friends are always good.
I didn't do that right away and I was miserable for a long time. I let my happiness depend too much on my husband, which put too much pressure on him, which made for a lot of ugly arguments and stress in our relationship. To sum it up, I was homesick and wanted to blame him for it when I ultimately made the decision to be there. Not fair to him and not fair to me either--I was unhappy when I shouldn't have been.
I'm not saying that's how it will be for you, but I'm just sharing my story. Moving away from home, for whatever reason is a good thing. It's an amazing learning process. It helps you to grow up real fast, too. You'll miss your family and friends and they'll miss you, so call them and email them a lot.