Personally, I haven't found it too difficult to maintain a group of friends, even while fitting many of the descriptions you gave. I am somewhat unusual in that I've had the same group of friends since I was 8 years old.

May I just enquire how long you have had this group of friends? I have found that very young people can actually be pretty tolerant of differing opinions and ideologies as long as conformity on other axis is high.

I have found it difficult to find a romantic partner, though there are confounding factors in that problem (going to a school which is only ~30% female).

This is a very interesting questions. Sexual relationships and those of strong emotional bonds operate on, I would claim, different principles than regular friendships.

On the one hand some uncomfortable truths send bad signals and definitely lower perceived value as a mate, on the other some uncomfortable truths about the sexes seem to have potential practical value.