Coping with change..

P
So my boyfriend and I are planning on making a big change in our lives... As of right now, he and I are long distance by about 3 hours in the same state so we do see each other, just not as often as we'd like so we want to get a place together. The issue? The place we agreed on is about 15 hours from our families, with an entire state in between us. He and I both want fresh starts and we both want that fresh start to be with each other so I'm not worried about that... The thing that scares me is being so far away from my mom.. Brother... Grandpa... New grandma in law.. Best friends... CATS (mom won't let me take them with when I move)... It's not like they're an hour drive away (last place I moved to wasn't all that far from them) so I can't pick up and go see my mom whenever I need advice or to pet my cats when I'm feeling anxious. How can I cope with this? I'm 100% sure I want to move with him... I'm just horrible at handling change and nervous to be on my own without family. Advice? Experiences? Anything?!