Hello monsieurben! Welcome

Those symptoms are definitely things that fit into the realm of bipolar but just because you might take on big projects and not like people telling you its a bad idea doesnt mean you are bipolar.(not saying you arent, just generally people have different personalities, we arent all the same but it doesnt necessarily mean it is a symptom of something)

It is possible you checked the right boxes but in reality those things were not quite how it looks on a checklist and your therapist had more info from talking to you more in depth or on the other end that your therapist didnt know very much about bipolar and/or you and therefore couldnt see it.

Definitely spend some time reading up on symptoms. I am not sure how else I can help right now but you are certainly welcome to ask more questions if you have any