Hi. You may be suffering from early onset androgenetic alopecia. Does your father or brother or maternal uncles have balding? This could genetically predispose you to balding. Further environmental factors could cause you to lose hair further. Onion juice may not be of great help. May also cause scalp irritation. Use antifungal steiprox shampoo for scalp. You'll probably need treatment with hair care lotions or serums - something that has vasodilator properties and improves thickness of hair and reduces hair loss. Have a good balanced nutritious diet. Hope this helps. Let me know if you need any further assistance in this regard. Warm regards.