I don't have much to say that wasn't said by previous posters. I also see external appearance as secondary when it comes to exploring my fetish with a woman.
That's not to say I don't have limits. I have eyes, for goodness sake, and I don't believe in the saying "in the dark they're all the same". But I've played with girls whose appearance one might easily classify as below average, and, as a matter of fact, I had a splendid time with all of them. Everything was totally erotic and the memories we created will stay with me always. With one of those 'below average' girls I ended up in a relationship which lasted over 18 months. That was about 15 years ago, and I regret breaking up with her to this day.
But I'd also like to suggest another approach: rather than worrying whether he's going to like your appearance, why don't you simply meet up with someone for a coffee or a drink and see how it goes? If anything, it'll be two people who share the same rare interest spending some time together. They might hit it off, or they might not (and if they don't it won't necessarily be down to either one's appearance). I believe they call this approach 'one step at a time'. 😃
In the end it's all about plucking up the courage to go outside your comfort zone. I would like to think you should feel safer doing this with someone who's sharing your excitement about such a meeting - and therefore might well have similar concerns and insecurities. One thing's for sure - daring to do it is its own reward, and unless the person you meet is a total asshole, I can only see it doing good things to your self esteem.
Be well, be happy, love yourself.
Lub-dub 😉