I am 23 years old female, and worked for four months in two companies. However, I am unemployed for three years, not stable in any company.

You have not given your educational background, the profile of companies where you had worked and why did you leave the jobs. If you give complete detail, I may be able to provide some solution. In any case, you are young and should not loose hope.

Work experience is the primary criterion.Don't leave any job without the full gain.