after reading comments ; follow your heart. Apart from that, use your common sense as well. Do not feel pressured into having sex simply because your friend, or anyone else for that matter, has already done it.
Take your time, wait for the right person, choose very, very carefully and get to know them very well, over a long period of time, before you make a decision. I think you should be 110% sure of what you’re doing and be able to feel completely and utterly secure in your partners arms. If you’re not, then the time and/or the person isn’t right.
Your first time is something that should be treasured, don’t throw it away for someone who isn’t worthy in your mind, or for someone with whom is just doesn’t feel right.