I have never seen you be anything but sweet and loving to everyone at PC--it is hard not to want to love you back. There are unfortunate exceptions but most parents love their children. They steal our hearts from the moment they were born when they look into our eyes. I wonder if some of your guilt is because you have gotten to know so many at PC who were not loved the way they should have been as children. Perhaps you are an empath. When I googled for the definition it read:

Empaths are highly sensitive. Empaths are naturally giving, spiritually open, and good listeners. If you want heart, empaths have got it. Through thick and thin, they're there for you, world-class nurturers. But they can easily have their feelings hurt.

Perhaps no one has "hurt" your feelings in a classic way but when you absorb all the pain going on at PC maybe you have turned some of it inward by feeling guilty that you are loved in a way others aren't? I really don't know what is causing your guilt. Just guessing but as others said I don't want to invalidate your feelings--it is the way you feel so I am glad that you are venting it here. It is good to examine our feelings otherwise sometimes we can end up acting on them in destructive ways. When we understand our nature, we can learn ways to cope with who we are......