part of why it's so hard is that modern economics grew out of "political economy" by pretending to divorce itself from politics and ideology, which of course it never really did. so you end up studying something whitewashed to pretend it isn't intimately linked with political goals and nothing really makes sense without also figuring out the real questions being asked. like you want to optimize the allocation of resources? great, optimize which resources for who, and how do you define the real cost functions etc? a lot of that stuff gets assumed a priori and you'll probably be going into an economics discussion or study with totally different starting assumptions than the economics math is using and get stuck when the math doesn't make sense
