Estranged from Family - Am I Enough?

 Not sure where to start...so I'll try and make this brief.

TLDR; Pretty much, I ended up cutting all contact with my intermediate family (parents & siblings) and I have mixed feelings... I have my own little family now(son and significant other) but I worry I'm not doing enough for them. I want them to know how much I love them and want to support them.

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I grew up with physical & mental abuse from my parents, along with SA from my mother...

My brothers and I used to be OK and flip flopped between enemies to best friends, to...nothing, but they're still brainwashed from my parents abuse after all these decades that I've decided to just cut them all out...

The youngest always ends up using people, which ends up affecting them badly (he's stepped on me before a couple of times, even introduced me to a *** friend of his so younger brother could benefit off of it...)
The 2nd oldest is not very kind-hearted, and ended up making me homeless (it's a long story).

The oldest still lives with one of my abusers (mother) and it's hard to talk to him for that reason.

Sometimes, I do miss the times when my brothers and I were all best friends but in the end...it probably isn't worth it, to deal with the heartache...

I've been trying to move on and not think about my family anymore after everything I've endured.

I have my own little family, with just my son and significant other.
My son's father (aka, abusive ex-fiancé who almost deleted me from this world) was cut out of the picture.

I worry sometimes that with my own little family, that I am not enough.
The voices from my past cloud me sometimes. I worry that I can't provide enough (currently in-between jobs) or that I'm not expressive enough about my love for them...Or maybe that I'm too much now with the "I love you" or doing things, that it might render my words or actions useless...

I grew up where saying "I love you" was weird to say and it was strange too to hug my siblings or parents...Until suddenly I left my parents home at the young age of 18 years old, then my parents suddenly started up with the "I love you" and hugging me. It feels...wrong...like they're strangers doing this. 

Can anyone relate to being estranged or no contact with their biological (abusive/dysfunctional) family while having your own family? (kids, significant other, in-laws, friends, etc.)

All I have right now is just my little one and significant other...
I feel lonely sometimes.
I used to have a lot of friends, especially in my younger years around college age, but I quit making friends now.

I've been burnout too much and it takes a lot of energy(along with time, and it's taken a huge chunk of my money with friend making)...

I think I probably should have friends, to enjoy different parts in life and to not put any pressure on my partner (he's not really close to anyone either, but...I still need my own life), but I'm going to go slow into friendship for now on. I can make friends fine, but keeping them or making good/compatible friends is a challenge(ex. there's some good people, but there's nothing to talk about really...they're just nice and it only ends up as small talk, which is not what I seek but am capable of making small talk.)...