At 18 you're a growing up girl
If pollution is high stay indoors and take a tablet of Paracetamol 500 mg Lots of water and ORS types of liquids
Vitamin C helps bleeding of nose
Next Steps
pinch the nose and apply some pressure
avoid eating heavy spices and ginger and garlic as they're blood thinner and lead to more bleeding
Health Tips
Natural
vitamin C is through lemon juice and citrus fruits like oranges. eat high protein simple diet like toned milk and curd daal roti chawal etc