Is my father's behavior abuse?

Ok for most who do not read up on me, my father has”eye surgery” back in 02-04, he was in Nashville for 6 to 8 months at one time, When he came back he was meaner and snapped at me and my other family members, then my grandfather got ill and he moved out to live with them, they like less then 5 blocks from us. During the 1 and half he lived there i saw him two or three times. My grandpa died on April 13,2005…. my father he yells a lot now, and he has became a different person….. He use to listen to me, and now he ignored me and my mother. I see him ONCE a day for 3 seconds, i bring him food to his work office, where he chats with females and small children. He calls them his “ Adopted family” When i talk to him he gets on the phone and ignore me, I went to the school, and told them about this and they said talk to him and all he did was yell and point my mistakes, and how i am gonna ruin my life with having a life. My family is one that i can see is falling apart. My dad is the “ Perfect” dad in his eyes, he tells people about god and stuff , and he always has to go to Nashville for some reason or another, if i go with him all he does is tune me out and leave at my uncle house all alone. I was a daddy little girl, so i guess its impacted me more then people think. but i can not take if he tells me one more thing i am doing wrong i feel like i could kill myself! also he will poke and tickle me and say he is playing even when i yell out from pain, he is hurting me in more ways then one. My dad is also a nudist. He tells me “ At least you’re not Abused” but is what he doing abuse? what should i DO?!