Time for this birdy to fly 💕

I live in Las Vegas, NV. I’ve lived here for about 5 years. Originally, I’m from Chandler, AZ. I completed elementary school there and 7th grade. We moved due to my mom being sick and we needed to be closer to the Air Force base. Sadly she passed away 5 months after we moved..Whenever I visit AZ, I feel so happy. Like I found my soul mate. I have 2 cousins there that I’m very close to and I have kept in contact with some really good friends. I want to move back. My dad and his wife had a kid who’s 2 almost 3 and his wife has a 13 yr old daughter. Our home is a 4 bed. My baby brother sleeps in their room mainly because the spare room is for guests. I don’t like it here in Las Vegas. I didn’t really make any friends 8-12 grade. I just don’t see myself settling and raising a family here. Idk why, but I’m scared to tell my dad I want to move back to AZ. I feel like I’m betraying him. But I know they need/want the space and It would be good for me to finally get a new perspective and be the adult my Mom and Dad had raised me to be. I’m 21 almost 22. I think it’s time. I just don’t know how to tell my dad and his wife because they can be quite critical. I’m not happy here, and I want to help them understand that this is something I need to do in order to figure out myself and my wants and needs and to grow. How do I go about something this big?