What are the Drawbacks of joining the US Navy?

I am currently in a pickle, there are so many opportunities outhere and don't know what to go for. I already know all the benefits involved with joining the Navy but cannot decide. At this point the main drawback is belonging to the Navy for at least four years. Is it that bad? I don't know. I just graduated from college with a Marketing degree, should I just go on to the world and start my career? Some of the reasons I would join would be to travel, meet people, get further education, and come out with a killer resume and money. But what are the drawbacks?