Tried to get back to university as a means to socialize more, in my 30s. It didn't work as intended, because attending classes while holding a day job left very little time for actual socialization with my colleagues. Ended giving up. I think it would have worked better with more free time to invest on it.

Pick easier classes I guess? Less Calc III and more photography and ceramics. Something the target sex is over-represented in.

It's not difficulty level, more like just raw time. Most social interaction occurs while hanging on between classes, while having lunch, paying a visit to the library, et cetera. It doesn't work when you rush in to the class and then rush out back to job soon after. Just hanging around people and getting to know them takes time.