To be completely honest, you sound like the exact opposite of me as I tend to feel bad when I'm not capable of showing someone the attention/love/care they want or need.
People tend to show that they care for me, miss me, etc (generally my family members, etc)
However, I don't connect with them on an emotional level like that and that may sound like I'm some sort of sociopath or psycho but I'm really not.
I do have a very strong morale of whats right and wrong, perhaps too strong as I see that me not being able to feel "love" or "grief" or w/e for say hurt/sick family members, etc. It's quite hard for me to explain.
You feel like no one respects you or cares about your feelings, and I feel like I'm one of those people that are incapable of caring about someone and show them "feelings" and this decreases my confidence of self worth by a large amount which is why I tend to not hang around other people and keep to myself most of the time. I feel like I don't belong, that I'm not "normal" (there really is no normal, but still) and I feel like I'm better off alone so I can't hurt others.
My mother attempted suicide and my sister, and cousins were crying/freaking out and my grandma was not crying but she was upset and confused as to why she would do it. People handle things like that differently as I've witnessed first hand, and I honestly didn't feel anything... to me it was just another day with the possible death of my mother. (sounds really bad i know)....... ANYWAYS
My grandmother, father, and mother have all asked me why I never simply say "goodmorning or hi, how are you" and it's because it honestly feels weird to me and doesn't come across my mind to do those sort of things.
My cousin who recently had a birthday, I was told to sign her birthday card and I just signed my name. She came over for the weekend and asked me why I didn't write something like, "Happy birthday, love -Thomas" or w/e... but again honestly it never crossed my mind.
Try not to be "hurt" or depressed because someone who you really care about or love doesn't show that same amount of care and love for you. People have different levels and capabilities of emotions of which they can display or feel.
That being said I do I guess "love" my family but I do not feel anything, I would miss them probably but I don't think I would cry over the fact that they're gone or dead. This could just be my "no feelings #heartless" or it could be that somewhere down the line of my life I was hurt too many times and I grew numb when it came to feelings to protect myself. In other words, I adapted to my own personal situation.
Just try to be accepting of different people and how they interact with you and take into consideration that they could have gone through a lot of shit that you couldn't even think of. Lower your expectations too.