Sigourney Weaver. More accurately, Ripley. It was the character, not the actor. I knew nothing about Sigourney Weaver. Still don't. But Ripley...oh yes! In a sweaty vest.
Although I wasn't a teenager then. Not quite. If you're narrowing it down to teenager, my English language teacher when I was 13/14. I didn't learn much, but that wasn't her fault. She might have been the best English teacher who ever lived, but the higher functions of my brain took a back seat in her presence.
Or one of my friends. Who, unfortunately for me in that context, was straight. But hey, at least I got early practice in dealing with that particular area of disappointment.