Too scared to kiss my bestfriend (boyfriend)?

I have the most amazing best friend ever who is also my boyfriend, we have known eachother for over a year now :) and we have been out 7 times (this being the 7th time) and we have never kissed! everyone thinks we should have by now because we do everything together and go everywhere together seeing as we are best friends :P and we have those romantic moments, but i'm scared. My friends are forcing me to kiss him in school :/ but i don't want to remember my first kiss being in a school corridor on the floor infront of the whole school! I am almost 15 and everyone I know has had their first kiss.. except me. i don't even know when the right time or moment is to do it :/