thanks guys, you calmed me down, because learning the other way to play would have taken much efforts and nerves.

To thumb position: My teacher said, "you can´t really say that one technique is wrong, but i would recommend thumb over the neck while bending etc. and when playing fast licks, the other way, because then you don´t have to move your fingers so much and in a result you can get faster, like al di meola, sometimes it seemed to be as his finger wouldn´t move at all, but the opposite is true.."