It seems to me like I have a different Under Saarthal quest then the ones I've seen on youtube because I fought through that dungeon with alot of mechanic spiders followed by a place with glowing mushrooms and then I entered a room with a big golden ball with a pannel with 4 buttons..I have to use my lexicon cube to usen the 2 right ones but need something round to use the 2 left buttons but I have nothing to insert there

That's Discerning the Transmundane. Part of the main quest, and only partially related to the Winterhold College. From your description you're in Blackreach, nowhere near Saarthal.

Under Saarthal is the first part of the College questline.

Check your quest log, you're probably following Discerning and have that one selected.