Missing people from the past

Idk if it's just me or if I have some sort of unhealthy attachment problem but I find myself living in the past a lot. During my 31 years on this earth I have moved quite a bit, went to different schools, changed jobs etc and have grown fond of people I was around at the time. I find myself thinking about past friendships, coworkers, extended family members that I no longer keep in touch with due to life just taking me in different directions. It sucks to always feel nostalgic about the past, remember the good memories and reminis with a sense of longing for those times. Does anyone else feel like this or am I just crazy?