I want to make my own bath & body product’s because my skin is very sensitive and is very quick to get a reaction from something that i think is very good :[ so I would like to know how to make a chemical free nice smelling and healthy for the skin bath&body product

Have you tried Googling for this? You’ll come up with A LOT of results.
Here are a few:
http://www.pioneerthinking.com/baths.html
http://ak.essortment.com/homemadebathpr_ojs.htm
http://homemadebathproducts.blogspot.com/