howdidithappen - the fella checking you out... keep in mind that he may be awkward around gals. Lord knows I was. I wouldn't know how to approach a young gal that I liked. He may be having the same problem.
Of course, he may also be having issues with your not being an 'approved sister' - one that is baptized - or pioneering, etc. (Which means that he can't ask you out - with an approved chaerone, of course.)
You should probably cut him some slack. Of course... he should be made to realize that he is making you feel uncomfortable. Someone should have a talk with him. If he wants to get to know you - then he should step up and say, 'hi'.
It's obvious that you already throw him off-balance. He forgets his 'duties' (door opener - haha), etc.
If you wanted to play with him, you could show him some 'knee'. (No - don't knee him in the groin - just allow your dress to show some leg up to and including your knee.) He would probably fall walking past you, staring at your knees. ;-)
Since you're studying, you are probably able to get away with wearing dresses that are not 'JW-approved'. This means that you might be able to wear pencil skirts, or skirts with slits up to... well higher than they like, and perhaps show a bit more cleavage than the 'sisters'. Of course, this will mean that you will be talked to about how you should dress - that is appropriate - so as to not cause fellas like this young fella to have... problems.
I was where he is - long ago. It ain't fun.
Regards,
Jim TX (an ol' fart now, but an awkward teen long ago)