It seems, based your complaint, that you seem to 'genetically'have thin hair. I am only suggesting this since I haven't seen your hair or scalp. In such cases, it is difficult to change the basic nature of your hair. But of course, in adulthood, factors like sleeping late eating junk food and not exercising do have a negative impact on hair... so if that is happening in your case you will need to start modifying your lifestyle. To know the basics of hair read this: http://www.skinmatra.com/single-post/2016/11/10/Hair-Woes-10-Things-You-Should-Know-About-Hair
Next Steps
Visit an allopathic dermatologist near you. Read this articles before you choose yoru dermatologist. http://www.skinmatra.com/single-post/2016/07/03/Skin-Troubles-Here-is-WHAT-NOT-TO-DO
Health Tips
Also read this articles: http://www.skinmatra.com/single-post/2016/11/19/Male-Pattern-Hair-Loss-Genetic-Or-Heredity and