talking

Well my little boy is growing up! He is 19 months old and changing everyday. He is so smart an fun to be with these days. I have to say I love this stage. Every stage is fun and different but I am loving this one. The only thing is he still isn't talking that much. When he is around his little friends he is always squealing and yelling and happy smiles but not the one to talk. He points alot still and says a few words but it has to be on his time. I know what he is communicating most of the time but still not clear words for everyone else to understand. The doctor is not worried but it just seems he is not even interested in talking. He will not mimic you but later on will say a word I had no idea he knew. Did anyone else have this problem with their little one? Any advice on how to encourage talking? We read all the time but I am not a talker so it is a struggle for me to talk all day.