Please don't post photos of your anus on the internet - bad idea.
Well, my first thought is that they could be genital warts. There are some links to pictures here: https://www.medicinenet.com/genital_warts_in_women/article.htm#what_are_genital_warts_hpv_infection_who_gets_them
However, if you have had them since before you were sexually active, and you're sure about that, they could be abnormal moles, or regular warts. The description of it looking "kind of like a brain" does describe a typical wart. If it is raised (like a pencil eraser) rather than quite flat, that points toward warts as well. You should definitely have them examined in-person by your doctor.