It's not perfectly clear to me what you want, but here are a couple factoids for you.
First, it's important to realize that the normal curve that histfit() calculates is a fit to the underlying data, not to the histogram of the data. So, if what you want is a normal curve fit to your curve, histfit() is doing what you want.
If you don't want a normal curve, then what do you mean by "curve fitting of your data"? Do you have some other functional form in mind? MATLAB can fit to many different functions.
If you want to do something non-parametric rather than a specific function, then one possibility is to do a kernel density estimation. MATLAB has a function for that as well: ksdensity().
