Am I a terrible person for moving out due to not being able to handle my grandma?

I live with my grandma & father. My dad is 54 and my grandma is 80. She has pre-dementia and is likely going to have alzeimar's within a year. I can't handle living with her. The constant need for attention, needing help with the same tasks over and over again, asking the same question thirty times... I just can't handle it. I'm about to turn 20 and going into college (took basic cles @ CC for a year). I'm moving in with my uncle to be closer to school & because I really need space from my grandma. Primarily the lattar. I feel very guilty about it because its not her fault - she legitimately needs help. She's not some leech capable of doing things but too lazy to do them. Quite the opposite, she's helped my father out quite a bit financially and she always wants to know how she can help me (but in all honesty, she can't help me with anything except finances and I feel bad for taking that - she can't help me with things like school work, fixing things, etc. - if anything, her help would make those things worse). I feel like I'm abandoning my dad, too... My grandma has caretakers that help take care of her during the week, but other than that my dad wouldn't have any help around the house.