Validation for how I feel

Hello, this is the first time i have used a computer to vent my problems, and ask for help, or gain a different perspective in regards to what im going through, so be gentle. First, a bit of background. i am 39 years old. i have one sister and following my father dying of cancer when i was aged 11, a step-father, a step-sister, and 3 step-brothers. i am the youngest. to say i am the odd one out in my family is an understatement. My step-father and my mother are both Cancer, my real sister is taurus, and my step-sister is capricorn....i am a libra. i learnt very early in my life that i am very different to everyone in my family, and also that they are all kind of similar to eachother. i cant remember how many times i have been ganged-up on, and just unable to maintain a positive relationship with any of them. there have been times in my life when i have been estranged from them, but it had always made me deeply sad and lonely, and i have continually tried to abandon my thoughts and feelings, just to fit in. Ok, recently, there was an event in which my mother betrayed me with a girlfriend of mine. My friend was manipulated and spoke about issues she had no right to. (for your information, i have told her how i feel, and am just taking some time away from her to deal with it) this resulted in me rasing the issue with my mother via email. i know the outcome of doing this before i worte anything, so tactfully, i created an external, fictitious, situation that following explaining, my mother could then tell me what she would do if she was the person in this scenario. as i anticipated, my mother did not answer my question so i wrote another email illustrating her tactics and hypocracy. she then replied stating i have so much "venom" in my writing, that she knows i hate her, and "so be it" if thats the case. i got into my car and drove to my mothers house to communicate face to face how i was feeling, and upon arrival, my step-father was sitting outside. As a courtesy, i decided to communicate my intentions to him. his response was to not worry about it if people talk behind my back, which led me to tell him he was focussing on the wrong issue - it isnt about how i feel if someone talks behind my back, its the fact i feel a certain way following the event, and have not had my feelings validated. he then said well i dont want anyone here to get upset, which resulted in me saying so i cant communicate i am upset - because that might upset someone else? he then became defensive and aggressive, obviously not wanting to continue this interaction, and he told me to "fuck off". So there it is. i feel so hurt by the people who are supposed to be the closest to me, and rationally, i know i am the one investing emotionally, so if i dont get my needs met, then i just have to cope, but who can i turn to when everyone pushes me away? my self-esteem, or, self-worth is so low, and i feel worthless. one side of me says "fuck them!" but its only on the surface, deep down, i feel so hurt and lonely that i just want to cry. thankyou for taking the time to read my circumstance. i know there are people who have issues that are more negative than mine, but i needed to say this.