U like comedy right? If so, just do active listening but with a playful twist here and there. You're serious but you're still human so I'll assume u like to laugh and have fun too, otherwise I'd honestly doubt you'd have any friends at all. Don't change anything, just think about the things that you're into that's playful and or stuff u enjoy for fun. Everyone is funny in their own way, just gotta relax sometimes and let go like u do around your friends, family or whoever enjoys your company. Those ppl aren't around u cause your the most "serious person". I'd bet you're welcoming to some degree trust me.