But what if a bank could give me a secured loan up to the amount of my documented contributions, while also holding that same money as collateral?

Yes I have considered the rent to own method.

We have 1st, last, and security deposit. 

It is also the only method of finding those recently vacant rental properties that the owner might be willing to sell while it is vacant. 

I know that the method I mentioned is riskier and not in any way ideal, so hopefully, all this due diligence will pay off and the next deal won't have to be like this. 

I am concerned that because of my age and lack of money I will not be taken seriously by banks when trying to secure a mortgage.

I am interested in implementing the BRRR method in order to acquire more long term rentals.

In a perfect world my virgin purchase would be a duplex-quad, one unit of which I will live in until I can secure my second deal.  

When you go looking for house to buy for multi family rentals, what do you guys use or whats your guys method.

When I did so, she told me I was supposed to have scheduled the walk-through and when I told her I didn't have time that day to do so, she told me it wasn't required, I could just leave the keys (and parking passes and laundry card) and a forwarding address to send me the security deposit refund.