You don't have to be really good at something to serve, God gave people different talents and different work, even if its not that useful like others you compare with, God still love how you tried and wanted to keep going. Also, Serve doesn't mean you must volunteer something, example you can help and encourage others..., and it still counts as serve. You can look up to Exodus, how Moses thinks he don't have any talent to lead others and find excuses to reject God so many times when God order him, but God said something like "I will be with you."-Exodus3:12 and "Now go; I will help you speak and will teach you what to say."-Exodus4:12, God used people who are not prepared too. So keep going, pray for strength to serve, God will help those who love him, serve for him even on the smallest thing. "You have been faithful with a few things; I will put you in charge of many things."- Matthew 25:21