Hey there!
I am solidly NOT flexible, and have actually damaged my hamstrings trying SO hard to stretch them!
We actually have another thread here on the forum for us to post progress pictures, to cheer each other on, and to share tips and tricks and ideas, what works for us and what doesn't.
It's right here: https://www.studioveena.com/forums/view/54888e4d-b880-4691-b910-32640a9aa0eb#bottom
The splits can take YEARS. Alethea Austin talks about her own journey to the splits- I think she said three or five years for her?
For some, very lucky, other people, it only takes months. But, I think those people are few and far between, and most of us have to take our time (seriously, take that time!), be patient, gentle, and stretch when we are seriously very warm, and listen to our bodies carefully. An injury from stretching is NOT FUN. I was out for about six months straight from my hamstrings, and that was just a few attempts at stretching too far when I wasn't listening to my body.