Honestly, I'm the same way with EdWin. So don't feel too guilty.
I've always considered myself more of a "fanboy" than a "fangirl" because I care more about the story in general than I do about "cute couples". Yet I find myself squeeing over every EdxWinry moment (and Royai moment too, lol). And thanks to that shippy EdxWinry picture BONES released, I think I've officially been turned into an EdWin fangirl.
However, like you, I look at it in a mature, thoughtful way and try hard not to fangirl too
And yeah, I understand where you're coming from. I do think FMA1 has a lot to do with the Royai vs. EdWin thing and the general dislike for Winry. Don't get me wrong; I'm one of the few here who ADORED the first series and still
does (well, the first half of it at least)...but if there's one thing I hate about it now, it's that they totally cut out Ed and Winry's awesome relationship. And because of that, Royai gets all the love while EdWin gets either:
"I like it, but not as much as TEH EPIC LOVE KNOWN AS ROYAI"
Or: "ZOMG i hate winry n i hope dat ed and winry never get together cuz i HATE THAT COUPLE!!!11 (ed iz mine lulz)"
OR: "Meh, I think it's just a brother/sister thing. It's better if they just stay friends. Winry might love him, but it's just a little crush and it won't last and it's one-sided blah blah blah..."
ORRR - "NOOOOOOESSSS IT MESSES WITH MY PRECIOUS ED/ROY SHIP!!!"
BTW, I'm fully aware that these are just stereotypes and not everyone fits into them. But from everything I've seen, these are the most common reactions. And I blame it all on FMA1. Grrr...