where do you live in germany? If you are 186cm morning then you must be around 184cm at night.
I live in the north of Germany and im 182-180cm and im shorter than average for sure. I see girls taller than me on daily basis haha.
So yeah I understand that you would like to be taller.
It's obvious that among the people of your height, only the ones who really feel short will visit this forum*, while others (which is, I would say, the majority, at your height) will not come here. So there's a lot of selection bias in play here. Sure, there are 6'0 and propably even 6'1' and 6'2' men in the world who are "definitely sure they are shorter than average", but the majority of men don't feel this way. I haven't been to Northern Germany, but I can testify with assurance that, living in Austria, there have been plenty of times where I have
not felt short, despite being almost 10 centimetres shorter than you.
* Except for trolls and some nutcases like Vader who "wanted to be 6'4".