Grieving my host family

looking for advice! tdlr at the bottom I am 16(f) and starting in June, I did a month of foreign exchange in Costa Rica. Lived with a host family, minimal contact home, the whole deal. I got back roughly 3 months ago? And I can't stop grieving my host family. Its not like they died, but its like I was living on a whole other planet that has just disappeared. I am still in contact with my friends and family, and I see their insta stories and posts but its so surreal. Everything I see in my everyday life reminds me that time has moved on and Im stuck in costa rica with my family. My family doesn't really understand me. They say I was only there a month, so how could I get so attached? But everytime I mention something that makes me sad(all the candy they gave me is almost gone, hoco is coming up and my mom wants me to take off my necklace I made with my host sister for the first time since I put it on, that one of my host cousins just had a birthday, ect.) They basically say im crazy. So I guess I'm asking for advice on how to move on? How do I move forward in life, without feeling like im leaving people I love behind? Has anyone else experienced this feeling and how did you get over it?

Tdlr; I did a month of exchange 3 months ago, and I feel like I am stuck in the past and I lost a huge piece of myself. How do I overcome this?