Hi You seem to be having male pattern hair loss. This may be inherited from your parents however stress, poor diet, smoking change in environment can all aggravate and accelerate the hair loss. Please pay attention to your diet and include plenty of fruits and vegetables and protein. Quit smoking and do exercise regularly. It is important that you meet a dermatologist so further hair loss can be halted by use of lotions and sprays which can help. Treatments such as PRP help in increase the density of hair and can be considered as the next step