Consider the following choices from Vanguard:VTSAX - Total Stock Market Index - Mutual Fund Admiral SharesVTSMX - Total Stock Market Index - Mutual Fund Investor SharesVTI - Total Stock Market Index - Exchange Traded FundThese are all the same exact product just sold to you in different ways. 

I admire the moxie to get started young and build, just make sure you have someone or a team of someones who can help keep you from getting too far out there.As for Midtown Memphis, try and connect with @Derrick Craig on here and even Terry Kerr who is not on BiggerPockets.  

You have got to admire the power of an affordable option is a very high demand rental area.

However, while I was succumbing to shiny object syndrome (admiring the fancy new kitchen, new hardware, and beautifully tiled bathrooms), my agent was crawling around in the basement crawlspaces, collecting cobwebs and assessing the plumbing.

I admire your spunk, but taking a bunch of classes is virtually worthless in the construction trades.

That's what I admire the most!  

I admire your drive that you started so early on in life:):) the SDSU neighborhood has some pluses( most important for you as a hacker, renting it around the clock and pay your share and cover the cost, also building long term equity more so with these historical low rates,, also whether SDSU or any other neighborhood in San Diego( which isn’t easy to find properties in that range BTW) is safer with the forecast that they say close to 10m households unfortunately can’t keep up with their mortgages by Mid 2021:(very unfortunate) and being at 400-500k price point it’s just safer for this climate, so lots of time for you to take bigger chances and risks in a more stable environment to achieve you goals.

I admire your enthusiasm, so I'm not trying to crush your idea, I'm trying to say right now in the STR market, it is NOT the time to go in marginally capitalized.

I deeply respect and admire your desire to own property in San Juan.

Be humble and learn as much as you can from others you admire.