How can I find a balance between boring and annoying?

I am naturally pretty reserved and laid back. I never have much to say to anyone unless they're one of my close friends. I feel like when I am in a social situation, I either act shy/quiet and I hold back from things (in other words, boring) or I try to hard to be outgoing and I become annoying. How can I find a balance between boring and annoying when in a social situation?|||Just add your input into a conversation. Don't go over board and start talking on and on, coming up with irrelevant things that have no connection to what is being spoke about.