Hello, Keira.
I was also diagnosed as an older person, at 58 I think. So I haven't faced the same challenges of having periods or thinking about childbearing with low counts that you may have.
However, I do understand the feeling that no one I know (except for those here) "gets" ITP. The attitude they project is, "Well, it's not cancer and you're not hemorrhaging on my furniture ... So get over yourself already." But, I think it's that way with any uncommon disease, or one that's not imminently fatal. It's not you; it's them.
There are younger women here who you may identify with a little better. Hopefully, one or more will pop in soon.