Not all of us are extroverts and ready to take the world by storm. Many amongst us are shy introverts and may even feel a bit isolated from others. This usually happens when a person is still in his or her teen years and going through the socialization process.
If you look gloomy, cry or get angry at the drop of a hat, nobody will actually like being with you. A smiling, happy, and positive person is always appreciated by everybody. Smile when you meet acquaintances or even strangers, say a cheery 'hi' and automatically some of your awkwardness will vanish.
Increase your Awareness
Many a time, awkwardness around people could be because you do not have anything in common to talk about. Increase your knowledge and awareness of the world around you. Tune into local, national, and international news.
For instance, if you are a reading aficionado, join a book club. Participating in book reading sessions as well as debates will help get rid of your awkwardness. Choose any activity,be it playing team sports or joining a dance class, and soon you will find your comfort level around people increasing day by day.
When meeting a girl for the first time, simply say "hi, how are you?" with confidence. Learn to make small talk about the weather, her daily routine, hobbies, etc. Refrain from asking any personal questions. Keep the conversation light. Also, do not harbor a tendency to impress each and every girl that you meet.
Just act cool, without feeling the pressure to appear good and interesting all the time. The same rule applies for a party. Parties are all about having fun. Even if you do not know many people at a party, ask a friend or an acquaintance to introduce you to others and then take it from there.
Acting with confidence (it's all right if initially you fake it), displaying a positive attitude, and being friendly and open towards others will help you immensely in overcoming your awkwardness.