You already know this isn’t “normal” since the people around you don’t have the same habits. Those noises and touching rituals are not something that people do all the time. Although it is certainly possible that your behaviors are simply strategies you learned to help you deal with anxiety, it is also possible that you have some version of Tourettes. It could be both.
It is not unusual for someone with Tourettes to find that anxiety increases the number and intensity of tics. It’s not unusual for the behaviors of Tourettes to decrease as people get older.
Please make an appointment to talk to a mental health counselor who has experience with Tourettes. I think you owe it to yourself to get some answers. With help, you may also learn how to deal with anxiety and to have more control over the tics.
In the meantime, this fact sheet might give you some answers as well: http://www.ninds.nih.gov/disorders/tourette/detail_tourette.htm
I wish you well.