I'd go to my 16 year old self and I'd tell myself that the Australian exchange student that you have a spare with and that you drive around with sometimes would probably have slept with you if you hadn't brought your buddy along to your house that time. Later she ask's you if you would've hooked up with her if your friend wasn't there just before she leaves to go back to Australia so focus on that one young man because she's leaving and she wants to hook up with a Canadian before she goes. Good luck. : )