My guilt comes from a variety of sources: lesbians saying that they don’t care about size (which is perfectly valid), women with big bosoms complaining about the pains that they cause (also valid), and scientists finding a correlation between misogynistic boys and a preference for enormous knockers. I’ve even read that some girls have ended their lives over dissatisfaction with their sizes. Basically, I have this impression that a preference for massive mammaries is something that only ‘trashy straight boys’ have, therefore I feel guilty by association.
That said, I try not to be a jerk either: I don’t shun or mistreat ladies for having small breasts, and I wouldn’t fight tooth and nail to prevent somebody from getting a reduction either. As long as she is happier with her smaller breasts, that’s great! I’m happy for her! And I don’t mind being friends with somebody who has small breasts either! So I like to think that I am not that shallow of a person. Also, maybe this is usual but I tend to associate big boobs with power and I would much rather be dominated by huge honkers than vice versa.
None of this erases my guilt, though.
Is my preference a problem that I should try to fix or am I worrying too much?
I'm not really sure there is a good reason to feel shame for what you find attractive - does your guilt actually help anyone else? What good does it serve?
Also, you have to understand that finding a correlation between misogyny in boys and a preference for larger breasts is looking at a variety of people - not every misogynistic boy has a preference for larger breasts, not every person who likes large breasts is misogynistic.
Regardless you're not a boy, and to whatever extent you embody misogynistic values or norms, I don't think your attraction to large breasts is a good example of misogyny.
As a side note, it's not uncommon for sapphic women to feel guilty for their attraction to women, often articulating that it makes them pervy or bad feminists, etc. - and you see a lot of language like "looking, respectfully" to try to communicate that cognitive dissonance ... but I think we shouldn't feel guilt for our attraction to women, and as a woman I like when people are attracted to me and don't want people to "look respectfully", lol.
So pls get over it, stop being a useless lesbian and embrace your love of big breasts.