@IcyMist
I am sorry you did not feel genuinely happy for a long time. We all have ouw own ways how we deal with things and what will make us happy. For some people being around people make them less Lonely and in turn can make them happy. For some people, being alone and spending time with yourself can make them happy. So it's really something individual. Some of the common ways can be to be self-aware, to know what we love to do and what can make us feel joyful, being Grateful for even those small little Happy moments, grateful for even those bad Experiences Because it taught us something, taking proper methods for self care and ensuring our well-being.
I know sometimes nothing makes us happy and we don't feel like doing anything but also know that only you can make yourself feel better and it's upon you if you wanna get stuck in that situation or want to move ahead. And I can understand it can be frustrating and upsetting to not have felt genuinely happy for a long time.
I hope you find out some way! Take care of yourself. ❤️