I felt like that as well with this job, especially after my husband died , and it took a while to work out that there are different ways we can give to others and what i could do - so now i use the skills the job taught me and the equipment it paid for to support things i do feel passionately about helping with, - the most major one being school permaculture gardens in Africa I dont have spare cash to donate, i cant be out there hands on all the time, but just sitting here, i can design their marketing materials and information leaflets (for free) - and the 9-5 hours demanded by the job gives me the space and time to do that outside those hours.
back on topic it is still something i do very much alone, but it makes me feel less lonely and more useful than doing nothing or doing something to pass time just for myself.