you might be surprised how much volunteering there is around you, it's not always advertised very obviously. have a look here:
https://do-it.org/
if you don't have much/any work experience then you may have to start with something that provides on-the-job training - cleaning, shelf-stacking, etc. do that for a while to prove to future employers that you can turn up to a job on time & do a day's work reliably & then you'll probably find that more opportunities will open up for you. you may decide after working minimum-wage for a while that maybe you do want to make some use of your education after all
if you're signing on, surely the Job Center can help you find interviews, training, etc? don't you have to be applying for a certain number of jobs a week to keep receiving JSA (or whatever it's called).