How do you get over being homesick?

I moved in with my dad last summer (he lived in another state) and lived there for almost a year. Well…we decided to move back to my old state/town because my grandma’s health is failing and because nobody wants to be friends with me in my dad’s state.
We just moved and got all of our furniture into our new house and my dad had to go to work today so I’m alone…and lonely.
My step mom has to live in our old state while we live here because she goes to college in the old state and can’t transfer. She left this morning to go back and I feel like crying. She’s better than my real mom because she actually cares.
My mom lives in this town too but I’m not allowed to tell her that we moved back because she would start trouble…this also means I can’t go see her and my brother.
I have friends here but they’re in school and I’m home schooled for the rest of this year so I can’t see them much.

I’m just really lonely! I want to go home.
I was really excited at first but now I’m going to miss the mountains where I used to live, our house, my room, the fact that we ALL lived there, the weather, and just everything!
That house feels more like home.
The house I live in now isn’t a new house per se. My dad used to own it and we lived in it for two years and then he moved to the new state to buy his dream house.

That also makes me feel guilty because it was their dream house! And my grandpa paid for it and now he’s going to be mad at my dad because he’s selling it.

I just don’t know what to do! I don’t want to live here anymore, I want to go back home but it’s too late.

What do I do? :(