Why do people treat me as if I'm unimportant or unvaluable?

What I mean is that my supposed friends don't really treat me like a friend. None of them really calls me up or ask how I'm doing. One friend of mine knew that I was going through a rough time and never even bothered to ask if I was doing okay or whether I had sorted out my problems. Instead whenever I heard from them it was always about them and what they were doing...etc.

People don't seem to care when I get upset either. Like if someone does something to make me angry or hurt my feelings they don't particularly care. A perfect example is my mother. I had a nervous break down at the end of last year and it was because of some things that were going on and how my mother and the rest of my family treated me.

The majority of the time I am fine and don't let these things bother me. But some days it hits me like a ton of bricks and it really hurts. I feel as if no one really cares about me. I don't have anyone to talk with about these things. So its just something I hold inside and it all just fills up inside of me to the point that I feel as if I am going to burst.

I don't understand why I am treated the way I am. I don't feel like I am worthless I feel like I am of value but some times I feel like people don't see me the same way.
Why do people treat me as if I'm unimportant or unvaluable?
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