My DMs never stop, always busy with messages from old friends and new people wanting to say to hi

Look you could be the next best friend, you could be the greatest love of my life (I doubt it) but I feel bad for talking to people here.
I am not always online, I disappear for no reason and no explanation.

I talk to so many people here I have hard time keeping up with who's who.
I am good friends with this lady and I don't remember how old are her kids and I am embarrassed to ask.