I need help

So for a while I’ve thought I had anxiety, I’ve never told my parents because my mom doesn’t really believe in it. My dad suffers from severe anxiety and told me that I have the same symptoms he does. It use to be manageable but now I’m paranoid and anxious about everything, I feel like I can’t enjoy life and it’s made me, at the worst, contemplate suicide because I simply cannot handle it. I’m 19, but I’m still living at home when I’m not at college and I’m terrified that my mom won’t believe or will think I’m making it up or worse, make me feel like a failure, she constantly berates my dad for his anxiety.

I know I need help, please, what’s the best way to tell my mom