Hi, welcome to Mystic Board.
I think your thoughts were most probably private and not read or seen by anyone. Although it is very easy to come to that conclusion but there is often a simple reason for a one off coincidence, especially if people know you and spend long periods of time together. Sometimes our thoughts are just that obvious and expected. Please don't get too worried over it, instead put it behind you and move on learning from the situation Do you have any reason to believe that your friends are psychic or mind readers?
There are many ways to block you mind from others using shielding and blocking techniques though if you want to persevere with this
Cassie