If it didn't stick, you know that's not it. You ruled something out. The only way to find what makes you happy is to keep trying different things until one sticks. Joining clubs and volunteering is only one way to do that, and one you can surely reject if you want, but it's one of the easiest and one that requires the least commitment. There is no magic answer to how to find what you want to do, you just have to try things and see what strikes a chord with you. What do you think everybody else does?