The ascribed role of the breadwinner, leadership and holding the reigns ("a real man") is much more prominent in CIS states and in Russia especially.
I assume that women would fear that you're unable to provide for them, let alone for a whole family, plus the fact that shift work often falls into the category of "casual work" and hence instability, both in terms of a relationship (as they'd fear to sit idly at home) and also financially.
Sweden most certainly has a decent standard of living and the income rates even within the lowest echelons of the economic strata can easily hold the comparison, even with what is considered a good income in Russia. However prejudice and firmly established impressions make it difficult, if not to say impossible to distinguish.
Instead of revealing your actual work schedule, you could simply say you're busy.