I keep seeing references to you making up numbers, then getting the Zillow estimates. Look up how to evaluate properties and deals and start doing the real math. For instance you're just comparing the mortgage (including taxes and insurance hopefully) to your expected rent, but what about repairs? Turnover? A simple rule of thumb is that 40% of your gross will go to expenses. It's a high estimate, but you can certainly hit that with a bad year. I had a unit spend an entire year either unoccupied or with a tenant who didn't pay, and left utilities in my name so I had to pay those bills plus eviction costs!
If your cash flow is negative can you still afford those extra/unexpected expenses?
You keep asking if it isn't better to spend $1k/month towards equity rather than waste it on rent, but isn't it better yet to get $1k/month in profit?
It sounds like you're discounting finding a better deal due to lack of confidence. Really think about that, there's a lot of range between a house in perfect condition and something that needs a full rehab. Maybe a house just needs some paint and a new roof, for instance and you can get a good deal on that. Or buy a little further outside the city.
Basically, I think you should do a lot more research, and math, before you buy anything.
You said you make $70k (which is awesome for your age!) For comparison, I make $93k and I don't even look at houses over $80k. So that $300k house your looking at...