Ahahah, that was funny :D
I thought the same, but didn't want to be mean. On the other hand the OP is quite confident about his proficiency, so maybe it was time :P
I think I can safely exclude myself from the "people who can't speak English". I work as a translator for English at the moment. Most of it was self-taught, because even though I loved the subject in school it wasn't until later that I actually used the language in daily life and started to get comfortable with it. Now I hold a C2 certificate and am very proud of my dedication to keep learning, speaking and reading this lovely language (I even like it better than German).
And you have to keep using it to not lose it. This, aswell, might contribute to the problem that many grown up Germans don't speak English that well (anymore). A lot of people don't get many chances to actually use their English on a day-to-day basis.
Korra schrieb am 05.07.2017:When i was in school, i had the problem that my english was to good. Most of the other students didn't understood me
That is quite some nonsense. More likely your English wasn't good enough to adapt.
I recently went back to study, and we had mandatory English classes. Due to shortage in the personnel they crammed us all into one class - me on the one end with my C2-level skills, people who have plainly forgotten that the English language exists, since they already hated it in school, on the other. I had no problem adapting to the different levels and make myself understood. If you are the one with the better language proficiency it is your responsibility to adapt (because YOU can) - not theirs.
PS: It is "technique" not "technic", despite what LEGO writes on their boxes ;)