Beach Trip Question? Checking into hotel under 21?

My friend and I are planning to take a trip to Myrtle Beach for my 20th birthday. As many people know, myself included, it's very hard to check into a hotel without being 21 or 25. We would really like to stay close to "the strip" of myrtle beach and be close to the stores and be close to the action so I'd really like to get a hotel on North Ocean Boulevard. Could anyone give me a list of hotels that will let us have a room being 20?