just as a thought experiment, what if you never find your passion ? Going through life from now until death just trying to find that passion.
And what if you find more than one passion? How will you choose between them?
I've been looking into happiness and philosophy for a while now trying to find that "meaning of life". I came across many great answers from existential philosophy. And yes, you are going through you 'quarter century' crisis where you sit and ask yourself "is this all that there is?"
The innate nature of a passion is that it's a process. It's not if you do this, then you'll be happy kinda thing. You have to find something that you enjoy doing. Like arts and crafts or working on research or whatever. You have to like to doing of it and that you will always like the doing of it. This is passion: it's the process, not the goal.
The meaning of life is what you make of it. It's whatever meaning you apply to your life. Taking in account for all your strengths and faults that only you know. Knowing that your type may help speed things up.
Just find something where you can say "I don't mind doing this everyday for the rest of my life" That is probably your passion, however anticlimactic it may be.