She already began transferring some of her assets to my older brother
Okay fine then I’ll live on
I’ll live in spite…
I want my half… why does my older gets stuff and I don’t
He doesn’t even love my mom as much I does
He never even showed any affection, I did… all the time…
Like is my mom really gonna just pretend I didn’t love her?

Unfortunately, there is no “my half”. There only is if they decide to give it to you.
Your mum won’t decide based on how much you love them. Manipulation through withholding love is a classic. Be careful.
Is there a way for you to become independent? Move out, get own place and job? Afford your own insurance and meds?