Hi OP, I hope you're ok ♡
Many men use porn and 40% of women have accessed it at some point in their lives too... it's actually quite normal.
On that note... a lot of porn videos have words like 'skinny' and 'teens' in the title. I assume this is the result of unimaginative producers thinking that is what every man wants, but the truth is it's not and your partner may not have actually tried to search for that specifically.
I think you need to find out exactly what is going on here. If I found my DH using porn I would not mind in the slightest, that may be a controversial opinion but for me personally, it just doesn't bother me. But that is because he makes it clear that I am an object of his desire too.
So that sounds to me like the issue here, not the porn itself, it's more that he is making no effort whatsoever to make you feel loved or attractive. That would be a problem even if he wasn't watching porn.
I bet you are beautiful just the way you are, eating disorders are a slippery slope and can make you really unwell so please look after yourself. Address the real issues in the relationship using the pornography as a conversation starter. Tell him how it makes you feel, but be sure to place the emphasis on his lack of admiration for you as opposed to making him feel like a pervert for watching porn.
Perhaps he is feeling distant from you because he doesn't know how to love and support you the way you need... be open and honest (though it is hard I know) and let him see what you want for the two of you to move forward.
Remember you deserve to treated with respect and loved for who you are, the way you are. X