Need advice on moving forward with bad/no credit

[Tanija Hudson]

My name is Tanija I am in Milwaukee wi 22 years old. I have been studying real estate for a bit of time now. 

So I began to start taking action found a deal contacted a mortgage company. Got my credit ran. They gave me a pre approval found a deal when it was time to began closing on the deal it failed because my credit history isn’t long enough. I have fair credit I was pre approved for a Fha. But now I feel stuck. Not sure how to move forward so do I just listen to the broker & wait for few years ? 

My dad is a investor he recommended me to continue studying & waiting. 

I genuinely don’t want use hard money, or family. Would prefer to use a mortgage.