How do I overcome childhood abandonment issues? I'm tired

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How do I overcome childhood abandonment issues? I'm tired of being unhappy, and I know this is the root of my issues.

Summary:
>dad left my mom and I when I was a baby
>I was having issues when I was about 7 or 8, and my mom got in contact with him so I was able to get to know him
>We do the father/son thing for about 4 years, then he leaves again
>His entire family cut off contact both times he left
>He died 5 years after he left the 2nd time
>His whole family suddenly decide they want me around
>Tell them to fuck off
>Fast forward to today, my paternal grandpa recently passed away, and it's dredged all this shit up.

Issues I'm having:
>Avoid any kind of meaningful emotional interaction with people at all costs
>Emotionally distant from my mom, and don't tell her anything personal, even though I know she's one of the only people I can trust
>Feel angry any time I see other people that are in happy relationships, either romantic or familial
>Any time I meet new people, I'm quiet and stand-offish, and take a long time to come out of this