i am a unlucky person

I think you need to change your attitude. Women like men that have convidence and that are sure of themselves. I see short guys with women all the time. Approach a women with a positive attitude and be yourself. Talk to them as if you've been friends for years and you might be surprised how far you will get. And don't give up. If it doesn't work the first keep trying. There is someone out there for you just keep looking.