Really depends on where your at. I grew up in a small town and the greater majority of people I knew at that age drank. It is your personal choice, but you should do it only if you want to try and feel that you have enough self control to handle it. Also you have to prepare for the consequences since in it is most likely illegal, depending on where you live. However, if you are already happy, then there is little reason to start.
Personally, I have tried drinking once and found that I did not like it. Sure there is a buzz, but I enjoy having full control of my actions and don't feel the need to sacrifice my wit by drinking.
If a lot of your friends drink and you still want to hang out with them, they should be cool and accept it if they aren't pricks. Just be prepare to became the designated driver for most of the parties.