Lex, you've been through hell with losing so many people in the past year. I think you're holding on to and needing your Dad is understandable given the circumstances.
If little miss step mother can't accept that then she's just an uncompassionate, selfish, um... person.
You're doing fine. Keep taking strides, focus on the present and pat yourself on the back for getting yourself through another day.
Don't let anyone else have you undermine your own accomplishments and don't take for granted the little things that you are doing right because those little things eventually turn into bigger things and soon enough your taking large strides instead of baby steps.
Give yourself lots of hugs, Lex. You deserve them.
((((((((((((Lex)))))))))))))))