I think the question of what to do to go about changing this quality certainly isn't a straightforward answer.

And I say this is because personally I think that the reasons why you feel this way are so deep rooted and didn't happen overnight.

But acknowledging that this is an issue is the first step towards change. You can't change what you don't acknowledge.

My bet is that you're going to need professional help on this one. I'd recommend a therapist.