I'm not a funny, interesting person to be around

I have social anxiety which makes it hard for me in social situations to be comfortable. 
I've been dating my boyfriend for almost 3 years now and I feel like I'm a drag to be around. He's outgoing & always is making people laugh, including me. But it's so hard for me to ever think of something funny or clever to say. I want to be a more funny person, but I never know what to say.