Do you need to have work experience for MBA in USA?Does working with your dad or your own startup count as work exp?

Yes, USA requires a minim work experience of 3 years but the average class profile of the top b-schools see an average work experience of 5 years. While working in your own startup can be counted as a work experience since you got the jist of basic entrepreneurship but there is also another option if you don’t have much work experience. 

So the best alternative for a student like you who wants to study management but without any work experience is to do a MiM. A MiM is equivalent to an MBA degree as it teaches you the same knowledge and skills. The only difference between the two is that a MiM degree is more relevant to students without any work experience as it introduces them to the corporate world in the right way. You being a fresh graduate should definitely consider doing a MiM rather than MBA. 

Let me know if you need any help with the universities that you can apply to or the admission process and I shall provide you with the detailed information.