BECOMING AN ACTRESS

Take acting classes, and try to get into as many local and school productions as possible.

I NEED HELP IN REALISING MY DREAM AS AN ACTRESS

THAT IS WHY I NEED YOUR HELP JESPAH

What you also need is a legitimate agent to market you. Get simple head shots taken and start creating a resume by doing what Jespah mentions.

jespah did help you by telling you what to do.
If you are good enough in school plays you might be able to get into a school of acting.
There are thousands of young actors who have no job with acting, but are waiting and waiting and waiting for their chance at a theatre, or Film or TV.
In the meantime they will work at supermarkets or any decent place where they can earn enough to live.