I only watched Doctor Who for the first time the other day (Tennant's final episode). I'm a little bit confused, when Matt Smith's regenerated as the Doctor why was he acting all strange? I mean why was he saying (paraphrase) "Still got hands, face, not a woman etc ect"? Does the Doctor keep the same mind regardless of rengeneration, kind of like Dax in Deep Space Nine? But if that's the case why was Tennant's Doctor saying he didn't want to go? Sorry for the stupid questions.

The Doctor always acts a bit strange after regenerating.

It's about half and half - he's the same person at his core, but aspects of his personality change when he regenerates. He does retain all his memories etc.

The 10th Doctor didn't want to stop living as his current incarnation because he didn't want to lose himself in the sense of no longer having the same personality.

If you thought Smith was acting strange try getting a look at Tom Baker at the start

The regenerative process scrambles the brain for a bit, so the new Doctor's personality never settles down until the end of his first adventure.