@Idk23866788 nooooo it's not sexist. Our periods really affect us in a lot of ways, mostly not good ways lol. Our hormones are completely crazy at this time, it's completely normal to feel like you want to murder everyone when on your period.
About the 'mot acting like yourself lately' I completely understand. I don't know how old you are, but I assume you're a teenager. Again, lots of hormones and a lot of things changing in our body. It's ok to sometimes feel lost, ir sad, or angry. Everyone feels like this from time to time. It's a very tricky age, where your old enough to have some responsibilities but not old enough to be taken seriously. It sucks.
Just know that it's ok to change and not know who you are. We change all the time, it's part of life. We evolve and we grow and we change our opinions and our hobbies and we learn new things all the time. Things we did in the past might seem weird and cringy. And it's ok.
Sometimes we need to let our emotions out and just scream into a void.
Idk if this helped lol, but I hope it did, even if just a little. Have a great day darlin <3