This is a part of yourself you just don't give away to anyone. Each time you make love with someone, you leave a part of yourself with them whether you realize it or not.( you will realize this later in life when you reflect upon it) If there's a reason you have decided not to wait until marriage, then you should have had time to date others quite extensively without "having sex". You need to get to know the type of person you respect and who will respect you. That takes years of dating. This decision should be based on a deep personal self-respect for your future, for it's these decisions now in life that affect your future whether you realize that they will or not. Wait as long as you can.
I am sure you are curious, however,, Sex is an act that shows true love between a man and a woman for procreation. .It is not entertainment for school age children who can't fathom the responsibilities that come from performing the act. Just because movies make it look like it is right for EVERYONE to try it, it does not make it right to do it. Discipline is difficult but very rewarding. Respect yourself. When a couple waits, the act becomes something very special and rewarding. That is why in marriage, the couple go on a honeymoon:)