I understand you, OP. My husband turned out to be a nightmare, and it does feel unfair. But if it helps, marriage does come with an opportunity cost. You have to spend a lot of time with their family, a lot of time managing their quirks, illnesses, issues, etc., and you could have spent all that time doing productive things or things that benefit you.
In marriage, you are also very subject to their moods, their sex drive - i.e. they can take all intimacy and physical affection away from you - and they can really make you miserable at their whim.
I guess I'm describing my own ex-marriage though.
I idealised marriage before I was married, and being married certainly cured me of all that. Even if my husband had been perfect, his family were an utter PITA, and extremely rude, too.
A happy marriage must be a wonderful thing, but there really is no such thing as a free lunch.
Ultimately, marriage is based on your partner's sexual attraction to you, and who the hell wants their security and stability to be based on that? See my recent thread in AIBU about hanging your stability on sexual attraction in marriage.
You say you're not beautiful, and I'm sure that's not true, but even if so, there's nothing stopping you from having a hot body and from being really stylish! I never thought Jennifer Aniston had a pretty face but she looks incredible in Friends!
Check this out, especially the beginning. This guy (a divorce lawyer) has it real when it comes to marriage. Marriage comes with a lot of sexual pressure for women much of the time, pressure to have sex, pressure to stay slim, pressure to be feminine. I think you should count your blessings.