OP, I’m a man but I get it (to the extent I’m able).
I’m ugly. This was made very clear to me by friends and classmates as a child, a parent, strangers in public and work colleagues. I have some stories where I think the cruelty that I experienced would shock many posters, and it sounds like you have some of your own.
I’m naturally very personable and gregarious so I was able to mask my unhappiness for much of my youth but spent many, many years feeling subhuman. I did everything that I could to stop it holding me back but it weighs heavy on the soul. I’ve since found some level of peace and acceptance (in that I do not spend much time being actively troubled by my appearance) but I’m sure if affects me on a subconscious level and has shaped aspects of my personality.
I have been lucky enough to find a partner that I love. She doesn’t want children, which simplifies the matter. In my heart, I want children and think I’m a natural caregiver…but the thought of a child inheriting my looks terrifies me (mostly due to the thought of them going through what I did, along with a smattering of fear of the resentment that they might feel towards me). I’m open to adoption but DP is unsure and we are not actively exploring it currently.
I’m sure some people will feel that I need counselling or support, and maybe they’re right, but it’s hard to shake the notion that what you have been told by almost everyone, throughout your whole life, is untrue and that it’s your mindset that’s the main problem (particularly if you’re still doing all you can to be sociable). The brave thing to do would probably be to try it, though.
I do agree with various posters that your physical appearance, however it may be, does not doom you to unwanted-singleness, forevermore - I would have told you that was my future until I met DP.
I don’t have much advice but wanted to offer empathy. The vast majority of people will find it difficult to fully understand, even if they have some hang-ups of their own. The only thing I might suggest in the immediate term is posting somewhere other than AIBU, as I think this subforum skews towards ‘debate’ rather than support.