Is it normal to hate people

I'm really not sure where to start but i think it was when i left the Army at 26, i swore that whatever i did in life i would be the best, i had so much fire in my belly, so much ambition, i got a job working as a security officer and within 3 years had three large sites 16 people beneath me and earning 25k plus.
Iwas always a happy go lucky type of guy always a bit of a joker and a cheeky chap. About 3 years into my employment things started to feel differently, i was starting to have mood swings, i didn't want to be around people and i started to feel guilty about my service in the Gulf.
I saw my doctor and of course he diagnosed me with depression putting me on pills, my head was all over the place, i couldn't be around people , i wasn't sleeping and this affected my work eventually leading to me losing my job as i was letting my guys go early so i was left alone.
Ithink the annoying part of that was not one of them backed me or supported me, I had even employed a few of them.
I got another job as a recreation centre manager but that also didn't work out, i was always so anxious and the panic attacks started one of the worst feelings i had ever had, i thought i was going to keel over any minute.
Because of this i eventually lost my wife, my daughter and my home, i was devestated and felt so alone. I shut myself away, i felt i couldn't converse with anyone i felt such a failure, how could this happen to me.
I met my current partner at a family party, she understands me and i git on well with her two children and she eventually fell pregnant.
The problem is now i see everyone with hate and distrust and i cannot seem to drop these barriers, i find it hard to socialise, and often feel i have no worth.
I am the oppisite to what i was 14 years ago and really don't know where to go from here, I sometimes feel like a schoolboy entering the big bad world for the first time but have no support off anyone as i can't let anyone into my life because of these feelings.
I really want to start again but feel lost. Am i to blame for the way i feel.