One of my favorite hobbies is singing kareoke. I love karaoke. It is fun to be at center stage and perform in front of everyone. It is a great way to demonstrate your singing talents. Just make sure that you are confident when you sing. The audience can pick up on a lack of confidence and will not be as interested in your performance.
You can sing karaoke at bars and in private karaoke rooms. There are positives and negatives of both. In private karaoke rooms you will just have to sing in front of your friends so it is a little bit less intimidating. You will also get to sing a lot more songs. The downside is that you do not get to perform in front of as many other people and so you feel less like a rock star.