Young man,
Finasteride does help - both oral and topical
Which to use depends on multiple factors and given your age, will require counselling (if dependent on parents) and medical evaluation before starting oral finasteride.
Combination of the two may work best once it is decided upon.
Safe starting dose will depend on your body weight and other factors.
Next Steps
Online Consultation to provide you a prescription and follow correct due diligence and process
Health Tips
Avoid handling your hair too much
Shampoo with mild shampoo eg Dove 🕊️ twice weekly only
Avoid parlour treatments like straightening, perming, streaking etc.