feeling alone

So, my whole life I have kind of been tossed around between parents. When I graduated high school at 16, my step mom and dad decided I was an adult and that they didn't have to parent me anymore. They have helped me out in times when I really needed them, and I thought that they cared about me. However my step mom is always telling me that I'm screwing up something, and making me feel like a bad person. My dad doesn't really talk to me. They had a baby three years ago, and I love that kid like he's my own. Which is the only reason I even talk to my step mom. I don't want her to stop me from seeing him. But it's getting to the point where it's causing too much drama, because I live with my grandma who can't stand my step mom. Also, I am always the one to go out of my way to have a relationship with my step mom. Apparently, my dad went to my grandma and said that I just can't take a hint, that I keep calling and my step mom tries to avoid me, and it makes me hate myself. It just hurts, and I'm tired of being lied to.