What Causes Lack Of Body Hair And Small Body Build At Teenage?

Hello, I am 19 years old male and my worry is that my adolescent growth, I feel is either too slow or too less. I hardly have any body hair and have very little facial hair. I also have very thin shoulders and a very small face and I look like a 15 year old because of which my classmates tease me and the girls are not interested in me. Its leading me to low self esteem. What can be the reason ? Is it anything to do with hormonal problems ? I masturbate from 4 years. Is it something to do with that ? Please help.