I’m scared

I’m 16 and my GCSE’s r next week. My dad and my mum split a couple years back and he is now engaged to his new gf who he loves. I don’t get along with my mum at all! We argue every single time we meet. She has moved to Stevenage so I barely see her which is good. However this summer after my GCSE’s I’m am being forced to move away from my home town to Cambridge so my dad can live in his fiancée’s house. I’m scared cos for the first time in my life I’m happy here. I have a AMAZING friendship group that I can tell will last and I honestly know I have found the one for me in my boyfriend. I’m scared that the distance is going to break up these relationships. I hopefully will be able to drive in about a year but I’m stressing so much and it’s making me feel depressed a lot when I’m not with anyone so they can’t see how unhappy I am about all of it. Any help ??