Dad problems...

Heyy I'm Emma, im almost 16 and I'm having some problems with my biological dad...

So, my dad and I have had many small arguments before but we are having a big one right now... I have PTSD, depression, bi-polar, and a few other things. My step mom (Lets call her Marisa), doesn't like me for many reasons including not accept me and not likening me because of my mental health problems and is jealous of me because I "get more attention" from my dad when I go to his house (one weekend a month). I have talked to her about why she doesn't like me and why she doesn't accept me and she very clearly said "you scare me when you are around my son (he's 11) because you might hurt him since you have mental issues" ... What's even worse is my dad was in the room with us when she said that and he didn't say anything like he agreed with her or something. I know he heard her because he looked at both of us when she said that and looked back at his phone like nothing happened. When i'm at his house all he does is work on his trucks and stay in the garage. I'm not supposed to go in there because there is alcohol in there and Marisa says that since i'm "crazy" (yes, she called me crazy because I have mental health issues...) and she thinks i might go in there, get drunk, and hurt someone or something? I don't know...

I just don't know what to do. I love him but, I feel like he doesn't love me...