Time and changing

Does anyone else ever have that feeling when you think back on who used to be a part of your life but then next thing you know everything is different and you've drifted from them? Whether it's people you used to hangout with or a past relationship and you really want to text them or catch up but don't want to seem so out of the blue or weird? I have this feeling a lot and part of me wants to ask how their lives are going but the other part just wants me to let them be in case they judge me... Sucks