volunteering for Thanksgiving for homeless is low key enough. Homeless and poor are not very social and don't really start a conversation,they are just happy to be fed in warm place. Same goes for Christmas .Depending where you live you can find volunteer centers for autistic kids,who are not the best socialites either,but extremely appreciative:you may get the info from children's hospitals or online.
HUmans are born to communicate,seclusion equals defeat.You have more to offer to people then you suspect .Get out there and share/enjoy this unique roller coaster of emotions :desire and fear,joy and sadness,happiness....which we call life.I am not the most social person,unless approached,but i try
best wishes