Saying "Hi, I'm Sierra. It's nice to meet you." is a common casual greeting. Not many native speakers say "hello" unless it's a pretty formal situation like a job interview or meeting your girlfriend's parents for the first time. In that case you could say "Hello, my name is Sierra..." <- add more information like "thank you very much for inviting me to your home Mr. and Mrs. Johnson"

Hi, my name is Hitesh. or Hi, I am Hitesh. Then you go on and say a little about yourself . It really depends on the situation. This is a casual way to introduce yourself. Hope this helps