Do i have a small penis?

Can't say: This is a public information site where volunteer docs answer questions based on what you write in your post. We have no access to anything else you may have posted. Since you did not include any description of relevant info (resting or erect length/girth) no assessment can be made.

See below: At your age, you have achieved the size you were going to and there is no treatment shown to make a man bigger. Do not get into manipulations, or drugs that will only harm you. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/.

Penile size: Penile adeuacy is measured, not by size or length, but by whether or not one's erect penis can satisfy one's sexual partner, and this varies tremendously. The penis generally enlarges and becomes longer when erect. A urologist or family doctor, or charts on an internet site, can give you averages.