Is there a way to reduce my forehead naturally? (Photo)

There are no natural way to lower your hair line.  Surgery is an option.  You need to educate yourself on risk and benefits and make an appointment with a doctor to make sure you are a candidate for surgery (if you want it).

At age 18, a male hairline recession is common and should be treated medically if it is abnormal. Hair transplants are an option once a patient has reached the mid-20's and the hairline is more mature.Be sure to see a hair restoration expert.All the best,

There is no way to naturally reduce it on your own, no exercises or any lotions or potions that work.  If you find that you are not balding, you can reduce your forehead size with a hair transplant to whatever size you want. See photo galleries in the web reference below.