Hair thinning day by day. Soap!

At once I have a thick hair when means i applying oil daily at once I stopped applying oil until a year in that year i used many shampoos like head nd shoulders all clear clinic plus dove panteen then the problem starts of hair falling nd after few years the thinning hair problem starts now also if i applying oil means hairs getting thick if I cannot apply oil means hair getting thin but I cant apply oil daily coz I am an studying engineering nd now I used alovera nd neem oil almond oil but not any changes now I have thinning hair problem if i applied also after using alovera hair thickenning stopped completely but alovera is good for my skin so tel me wt can I do for thinning hair my age is 24 now I can't using any shampoo for hair washing just I using only Patanjali soap