In my opinion you have a lot of time to experience life just don't rush it. At 14 your main focus should be your education. As for you social life you can go to movies, shopping at the mall or parties with people in your age. You can also hung out with members of the opposite sex but that's all there is to the relationship.
I have a younger sister who is 14. In terms of boyfriend/girlfriend interactions, they will hold hands or sit close together. Sometimes a kiss on the cheek is ok. Times are changing, and kids are starting relationships sooner, but you don't want to ruin your life just yet. An easy way to tell what your limits are is if you start to feel uncomfortable, stop right away, and go back to what you were doing before you felt uncomfortable. If the boy (or girl) doesn't want to stop when you do, and they won't listen when you tell them to stop, that is not the kind of person you want to be with.
Some obvious precautions are, don't find yourself alone with an older boy who may expect more from you than you're ready to give, like your virginity, don't go to parties without adult supervision, and don't drink alcohol because everyone else is, and never ride in a car with a driver who has been drinking. Enjoy group activities, this is where the fun is, for now, anyway. Just have good judgement and keep yourself safe.