I find laughing difficult. Not because I don't have a sense of humour, I get jokes but I very rarely find something funny enough that I can't help but laugh out

I find laughing difficult. Not because I don't have a sense of humour, I get jokes but I very rarely find something funny enough that I can't help but laugh out loud. I'm not sure if I've ever laughed out loud at a sitcom, even ones that I enjoy. The same for stand up comedy, the rest of the room can be in stitches but my expression rarely changes beyond a slight grin. This can sometimes be awkward when somebody is telling me an anecdote that is intended to be humorous, because I always end up feeling like I should force out a fake laugh.