Foucault said
Main thing here is it sounds like you’re misinterpreting your win rate from the blinds. It’s going to be negative. You’re posting money blind! The baseline isn’t 0, as it would be from other positions, but rather -50 from the SB and -100 from the BB. That’s what your winrate would be if you folded every hand. So whatever strategy you are employing, it’s adding value. Basically, you’re cutting your losses when forced to bet blind from the worst positions at the table.

 

That said, your 3-betting strategy doesn’t sound great. If you’re 3-betting every Ace, that’s way too much. And you should be cognizant of stuff like original raiser’s position, stack sizes, etc. There’s really no easy answer to “here’s the strategy for 3-betting OOP”. I suggest you start with my Getting Off on the Right Foot series to help you orient your thinking about poker and Expected Value generally, and then get a sense of what others are doing from the BB by watching HH review videos, and then perhaps post some more specific questions here.  

Hate to be picky, but a small correction if I can be so bold – if we’re including antes, it’s -60bb/100 from the SB and -110bb/100 from the BB, assuming 10% antes. It’s also -10bb/100 from every other position, which is something people underestimate a lot – breaking even playing a certain hand is better than folding if there are antes in play.