Magento 2 – Getting wrong quantity from a simple product

I’ve only recently started working with Magento and developement in general, so I am new at this. I need a (simple) product’s quantity for some custom logic. But I don’t know how to get it into my .phtml template. I used this function:

$quantity = $_product->getExtensionAttributes()->getStockItem()->getQty();

and

print_r($quantity);

to see what it returns… and it always returns 0, even if the item is in stock.

Then I tried

$quantity = $_product->getExtensionAttributes()->getStockItem()->getData();
print_r($quantity);

and got this:

literally everything except what I need :D.

While researching, I found a few people that said you need to create a module for this. Is this the only way? If so, how does one do this?

Thanks