Sure, why not? Just lock down all your information. Make everything privet. Only add the people you know. Don't get involved with games and advertisements. Be scared of the games! They will make your parents wallet scream with fear!!
If you think it is dumb, then don't get it. For me it is great but I am old. It's a great way to keep in touch with old friends. At 14 you are making those friends now and see them often enough you don't need it. Besides many kids your age are all about the drama, so why give them another stage?
It's exciting once you first get one, then it gets boring. But that kind a depends on who your friends are one there and stuff. So you don't HAVE to have one of you don't want to. PS. I like your profile pic :D