This is how you must introduce yourself in jam session.
Hello everyone, My name is Sam. I am 21. I hail from Chennai. I have done schooling from ( mention your school name) and I am graduated from ( mention your college name). I thank you for having given this opportunity to speak a few words about the topic ( mention your topic).
These are some suggestions while you introduce yourself in jam session. First maintain your total body language in the best way possible. Do not show that you are tensed or worried. If you have a shivering problem, do not carry any objects in your hand ( holding mic etc). Just speak your topic with out mic. Your eye contact plays a great role some times to unleash aside all your worries and get through well.
Your introduction is the foundation for your jam topic. If you do it with confidence, then you will gain that postive impression asap. So maintain confidence in the initial few seconds. I.e. during introducing yourself in a jam session.
Do everything normally and look as if you knew something about the topic. Never show the people around that you are unable to speak about the jam topic. Always practice with few jam topics before even appearing for jam session. In this way, you will gain that confidence.
Do not be taken away by crowd or interviewer or teacher around you. They are indeed good people. Do everything as if you have done this jam session many time previously.
Smile on your face while introducing yourself in jam session plays a vital role in getting through successfully. Maintain a short smile. Do not only look at your friends sitting beside you or gaze at inappropriate place. See at the person with whom you suppose to talk and deliver your just a minute session.