suga, i had to learn to love myself first. that was a journey in itself. there were things about me i discovered i didn't like. i needed to change those things. the things i liked about myself i reminded myself i had them. a list of assets helped. when i felt down i'd pull our that list to remind me of my worth. the void you feel imho is this lack of self worth you feel about self. the-your-happiness comes from within. i thought i'd never get to hurdle over this and be "happy: either. i like the word "content" better, tho.
therapy did help me new ways of dealing with and untangling stuff. so much of my baggage was blaming myself for other's misdeeds. i internalized them. it devalued me. it made me depressed. i was a "worm."
in therapy i had to take responsibility for what we discussed each session. it can help you too if you follow that "rule". that way your T can give you coping skills and enable you to manage things as they come along. so therapy sure shortcutted my learning truths. before i had no hope at all. kept telling T, i just want to be happy. he said if wishing could make it so, you'd be the happiest person in the world! so action works, wishing doesn't.