It isn't easy to deal with shyness. I have the exact same feeling, like you need to feel comfortable with them so you can act like yourself. There isn't a sure thing to get over it and be like others, you just need to start (putting your foot in the water) start being you round people you have just meet.
I wouldn't worry about what people may say when you comment on things, because if you do then you will always worry and will hold your tongue. And you shouldn't be kept from what you want to say.
I hope this has helped.