Same here. I'm in my mid-thirties but am regularly mistaken for someone in their twenties. I look positively ancient in comparison to these girls! The one in the picture definitely doesn't look 18!
Having older men creep on you is, sadly, part of the standard experience of any teenage girl. It's not endearing or empowering you in your sense of womanhood - mostly it just makes you feel out of your depth and struggling to wiggle out of an uncomfortable situation while remaining the polite, friendly kid(!!!) you've been brought up to be. And not hurt anyone's feelings - because, again, that's what you've been brought up to do.
I remember the feeling vividly and it wasn't a good one. But having someone as horrortastic as Jon do this to you? It must be ten times worse! Imagine a creep who not only gets uncomfortably close but who also engages in extreme emotional blackmail, paints themselves as the perpetual victim and would arguably not shy away of accusing you or anyone who came to your aid of virulent transphobia for turning them down?
My dad once decked a bloke who wouldn't take "no" for an answer from 15-year-old me (and, no, violence is not the answer - but, man, did I love my dad for doing it!). If the same thing happened to Yaniv, he'd undoubtedly call the RCMP to report an assault and a hate crime.
He just needs to stay away from girls! I'm not even being sarcastic anymore! It turns my stomach!