This isn't strictly a Pathfinder thing but I like this community.
Basically, there is this meme that Human Figher is a "boring" default choice or sign of an uncreative character. I disagree. Picking out a weird ancestry is not creative. Choosing a human fighter basically means that you get zero flavor from your ancestry and class - so you are forced to get creative yourself. You are forced to give your character a personality, and you are forced to solve problems creatively.
For me, the stereotype is the opposite - if a player chooses an esoteric ancestry and class combo, I worry that their characters whole personality is just their ancestry.
Of course both humans and other ancestries make for great characters if done right.
If your character concept is "complete" before choosing your class, consider being a human. Other choices carry along more "baggage" that may distract from what you're shooting for.
Other players can be like "What kind of elf would...?" etc., but they don't do that for humans.