^^^ David is more suspicious (or should that be 'cynical'?) than I am.
Welcome to AB, Jack.
As this website is based in the UK, don't expect too many answers here within the next few hours (as it's about 2am here at the moment). Further, things might be a bit different here (with regard to employment issues) than they are in the USA (where I assume that you're based through you're use of terms like 'major').
However, for what it's worth, I'd suggest staying in your present post for the moment, while actively seeking another job. If you resigned now, other employers might be suspicious of a candidate who's only held their post for a fairly short while. They could well suspect that you were 'jumping before being pushed' after failing to come up to standard. (It's no use having excellent references if your application has already been thrown into the bin before the potential employer gets to see them).
All over the world there are graduates working in McDonald's after quitting their 'professional' jobs on the assumption that they'd easily get another one, so it would seem silly to risk ending up in a similar position.
Your present post might not be to your liking but it's not as if you're being required to do tasks that are dangerous (as, no doubt, some employees are in their jobs) or being subjected to massive harassment from senior colleagues (as lots of people are). Such things might provide good reasons for getting out at the earliest opportunity but you're simply one of the billions of people around the world who don't like their job. Put up with it for now but get out when you're sure that you've found something better.