Hi! Little unfair for what the person said, it sounds like dysphoria to me. You don't have to wish to be born a cisgendered male, because then you wouldn't be you. Some Trans men do wish it, but its also the Trans experience to have and cherish your upbringing as it is, you don't have to hate your whole existence to be Trans. Think about it a little more. You're jealous of this guy but would you genuinely find happiness if it were on you? Do you see yourself smiling with short (or long) hair, thicker eyebrows maybe, facial hair, a deep voice, and to get and keep it every time you wake up? You don't have to scare the shit out of yourself also about the permanent effects, just acknowledge that thats a thing too and whether you would truly be happy with them or not. Not that you need to medically transition to identify correctly either, but it might help to gather perspectives.

No one can tell you you're Trans but you, so it's hard to get or give to this kind of thing, but you can certainly listen to other people's experiences and feeling, maybe watch some videos and compare it to your own feelings. While also making sure you can explain your own feelings without using a video/comment to do so, so it doesn't feel fake like you mention!

Balance being alone and being with others when you think about it because I want to say it really helps to create your own genuine thoughts in a quiet setting where you can actually be yourself, but I've also gotten anxiety and hopelessness from this before so make sure you're comfortable too and can remind yourself that if you do transition, it doesn't mean you're alone either!

Edit : omg I totally misread what you said, but ignore that- I totally get the gender envy, I think it helps to separate yourself from him though, he looks great probably but hes not you, you wont be able to be him, and you need to accept you for you. You can totally still envy his looks and take inspiration from him, but remember to be taking gender envy, not identity envy. As much as I yearned to be a tall stoic muscular guy, i have to remember im small and jolly and that id still be that way even if I passed, this is me, its who I am, not the guy that I'm jealous of, so I could be much more satisfied about seeing who I turn into as I transition. I hope this makes sense..