Why am I so homesick as an adult?

kinda long post so sorry in advance lol

so I F(25) drive 45 minutes to my best friends house after work once a week to spend the night and babysit her infant daughter the next day for 12 hours. i always have an amazing time, i love my niece to death and have been watching her now for over two months. but once im here and it’s time to sleep the night before i watch her, im filled with homesickness, anxiety, and sadness. i live at home with my parents, my sister & BIL and my infant nephew. i’m only gone one night and one full day but the immense sadness i feel at night is ridiculous.

for the past three weeks i’ve watched her i cried my eyes out the night before. my head just goes straight to my dad and how i miss him and i wish i was home. it frustrates the hell out of me because i’m almost 26 and i’m still crying because im away from home and miss my dad. i did this a lot as a kid whenever i would go to camp, or spend the night at friends houses but grew out of that once i was a teenager. but now it’s back since im sleeping away from home one day a week.

has anyone else experienced this, and what helped you deal with it? i just feel so silly bawling my eyes out at my big age because i’m homesick.