hahaha, you have no idea of the mental image I have in my mind when I read your title. Haha, inverted triangle. Sorry, that just sounds funny. But seriously, I don't think anyone can judge without a photo. And honestly, I don't think it matters. Depends on what your personality is like, really.
In my opinion, the only thing someone can have that will automatically make them less attractive is a lack of confidence. If you find a way to feel fine with your looks, no one will think twice about whether you have an "inverted triangle" as you say, for a face. Lol I'm sure you look fine anyways, so don't even worry about it.