I'm typically inspired to volunteer when a cause and/or community I care about is being negatively affected by something that my volunteering could make a positive difference on. It nearly always comes with a plethora of perks - coworkers/teammates for social connection, job training/experience/references, and free use of utilities being the main ones I note.
If you don't want to volunteer, then for heaven's sake
please don't. An attitude like yours spoils all the fun.
Whenever I find a volunteer position is no longer enjoyable, I either change things around so that it is or - usually after unsuccessfully attempting that - gracefully bow out and move on.
I currently volunteer at a non-profit's specialty library open to the public. Doing so has resulted in encountering a lot of interesting books and worldviews, learning what management style I work best under, proven tenfold that I'm still far too disabled to get a job no matter how badly I want to, and caused me to discover I have a deep passion for book preservation and repair...something I never would have guessed. Seeing the results of my labor on the shelves gives me immense satisfaction, and offering that to patrons looking up info on sensitive issues is personally fulfilling.
As side perks, I've got restroom/shower access, full kitchen access, water access, and now they even let me charge from their grid because I requested it and work with them to maintain discretion. I'm surrounded by a community of people who know me, who've worked alongside me, who actually care if I'm having a bad day and vice versa. And they've come through for me in emergencies. And I them.
All that stuff makes volunteering way more worth it than I ever could have hoped.
Back in the day people used to have "work parties" when some large task needed doing with many hands. The idea was to turn a daunting chore into a pleasant social and community building event. Now it's just called "volunteering", and only those who've participated before are 'in the know' about the enjoyment hiding behind all that drudgery.
But hey, if it isn't your thing...it isn't your thing. You're totally welcome to go find something else in life that makes you happy. *shrug*