I'm 20, is it possible to stop hair loss and regrow my lost hairs ? Which treatment do you recommend for excessive hair loss?

Dear Zibran
Thanks for the question. Normally, hair loss starts between the ages 18-25 in most men. When a man passes his 35-40 age, hair loss usually slows down and after the age of between 50-60, it increases again. This information shows us that the process of hair loss is progressive and throughout life. But there are always exceptions to the rule.That's why It is always more efficient to have a medical examination. But hair transplantation is permanent and always offers successful solutions. I wish you all the best.ozgeergun.com.tr/en/

Hair loss in men is usually related to genetic causes in most cases.  There is no way to reverse this just as there is no way to reverse aging.  However there are many treatment options.  It is best to see a doctor for a diagnosis and treatment options.

Early hair loss in patients with a strong family history of hair loss is not uncommon. After an evaluation with a hair restoration specialist to rule out other medical issues that may be causing hair loss, multiple treatment options exist for young patients with hair loss. 
Minoxidil topical is a great option and can be safely used by most patients for many years with very few side effects. Finasteride (oral pill) is a very powerful medication for slowing or stopping the progression of hair loss. Another option in young patients is PRP injections, which are performed over a series of treatments using the patient's own blood. Finally, laser/light therapy and other topical treatments are available. Hair transplant may eventually be an option, but not at age 20. I typically recommend that patients are approaching their mid-20's before considering a transplant session.
All the best,

Based on what you have described, it is very likely that your
hair loss is due to genetics. It is always a good idea to seek medical forms
treatment as soon as possible. This can help limit the extent of baldness. For example, you may want to talk to a hair
restoration specialist about using Minoxidil (over the counter) or Finasteride
(available as a prescription). Minoxidil increases blood supply to the
follicles. And Finasteride helps block the breakdown of testosterone to DHT
which miniaturizes the follicles.

You may also want to consider a hair restoration procedure at a
future point. Your doctor can recommend an appropriate time once the rate of
your shedding has stabilized. In the
meantime, adopt healthy lifestyle habits as this will contribute to the overall
health of your follicles. 

A multi-therapy approach is something you should consider.  Addressing the same symptom with different treatments can have an exponential effect.  Combining Minoxidil, Rogaine, Laser and Cellular Therapy is not out of the question for someone thinning as your as you are.