Hi, I’m an 18 year old guy in my last year of sixth form, I’ve never done anything “romantic” in my life before, I’ve never kissed a girl or dated or anything like that. Not to brag but I’m moderately good looking, no Tom Cruise but not bad looking either and I can certainly hold a good conversation, so I know what your feeling. In my case some of my friends both male and female have lost their V-Cards and have dated multiple people so I get that it can sometimes make you feel like you’ve experienced less or are “behind” in some way, but in my case I haven’t done these things because the right person hasn’t come along or the timing hasn’t been right, in my view why waste something you can never regain and something that means something to you on someone you don’t love or care about, for the sake of saying you’ve done it, and as you’ve correctly pointed out having sex with a friend can ruin a good friendship, so if you are attracted to this friend then I would say ask yourself do you think you could have a future with this guy and if so then definitely pursue a relationship with him, then any relationship you have with him will be based on genuine friendship and love (not to sound cringey) and not just causal sex which will most definitely ruin a good friendship. So all in all I would say don’t worry about having sex, wait for the right person, most people around you who sleep around will regret the consequences and their actions for the rest of their lives, all for what, a sense of “maturity” or a few moments of fun. If I were you I’d wait for the right person to come along. Good Luck!