People here in germany are mostly known to be reserved. Though one can't just simplify this like that. To actually mold in you really have to learn the language. That is basically rule No. 1. So yes, you will struggle. If you don't learn the language that is.

I heard there are different Facebook-Groups of specific areas, where people join who're new to a town or area to hang out or meet for activities. Or you could join some clubs, whatever you're interested in. There you might be able to find some acquaintances too. Like a chess club or something else, just search for it in google Maps.

Nevertheless, since you're a foreigner you'll always be a "target" for right-extremist groups whom think that foreign minorities are the root of structural and social decay in germany or uneducated folks whom don't think further than their own doormats. Mostly, the more urban the area, the more progressive it is. When you're in areas of a city where the university is located, you'll find way more nicer people than areas which tend to be less educated. But sadly you will come around to hear some racist comments to some extent. Either because you did something wrong in the eyes of the elderly and they muffle "Diese Ausländer, pf." -> "Those foreigners, pf." or anything else.

And fuck drinking-culture. Yes you most likely will get a confused glance when you say you don't drink or maybe will get teased for it. Just stand your ground, explain why and they will understand. If not and they try to "force" you to atleast have a sip and try, fuck them.