Jossef, you've found a GREAT polo there, look how it makes you look nice and big! Score!
My only advice would be to maybe undo that top button. That way it looks like you're too big to comfortably button that top button. That shirt does wonders for giving you a good physique, let it work for you a little more!

Buttoning it gives you a smaller looking neck.
When it comes to colour, don't sweat it! You can absolutely pull it off. Guys do wear pink, it's more just something for people who're not passing so well to maybe avoid, like long hair. It can make it harder to pass if people are on the fence about whether you're a guy or girl, but you simply look like a guy wearing a pink polo. If you like it; rock it!