When I start MC, the little Mojang field pops up and charges it all the time when I click on it a few times. I have no idea what to do
Just do not click and wait
Update Java, update Minecraft, older version e.g. Try 1.8. If nothing works, which operating system and how old is the PC?
Windows 10 per / about 1-2 years
That sounds good. Which graphics card does the thing have? Is it fast otherwise? You should definitely wait 3 minutes before you click on it.
I have a Gtx 970
and everything runs smoothly