How do I deal with self-loathing?

How does one move forward, away from my haunting solitude - the reminder of not being loved regardless of outcome drives me insane!
A recent heartbreak have me falling down a deep dark hole that I seem to try to claw my way out of to no avail.

How do I stop this loathsome thinking. I keep telling myself: "I am loved, i am loved, i have friends and family who would hate to see me go".
But then days come where i'm reminded how lonely I am by people who have used me in the past. What then?
Do I just shrug it off?

How can I deal with my negative thinking differently?