Having problems

The only real father I have ever known is gone passed on to god. It hurts so bad and some of his family treat me like I'm nobody including my kids they do the same. He had been in my life since the age of three up to age twenty-seven how is he not my dad? My oldest daughter is giving me hell I don't know what to do I'm messing up in school. I'm trying not to lose my head and I miss my father so much he was always there for me to talk to and now his gone. My mom is there but its not the same he was my star that shined on me my star is gone. Sometimes I think I can't do this without him but he wouldn't want this. My son thinks he's my dad because he's named after him this helps he's crazy like him. My thoughts will always be with him wishing he was he. Daddy's little girl always and forever.