As usual your post is very well articulated and you seem to have your head about you. You seem to be on the right track for a healthy mind and self.

that's not the reason I'm replying though, it's only in response to your question as to why your friend seems to garner more male attention than you and the answer is actually right before you as you wrote more..

First, just an assumption but she sounds like she's somewhat outgoing in public. That right there helps in gaining attention in general and therefore from men. I know that you're not a shut in but I get the impression that you're typically more reserved and men I think, see the less reserved women more easily even if they aren't necessarily attracted more to them. The other thing is and possibly the most important though seemingly intangible one. You pointed out that male attention just isn't all that important to you and clearly with her being on tinder and what you've said otherwise about her, it is more important to her.

Of course this seems like something that would be internal but it comes out in every aspect of her personality in that if she finds male attention something important, her actions, her attitudes, her behaviors will all reflect that and again even though it may seem like an intangible thing, males can sense that (or females in the opposite type situation) You don't need the attention so your actions reflect that too!

hope this helps even though I know you weren't asking for help in this area!