Jeff awoke from brief pass out due to the overwhelming pleasure of masturbating his new vagina for the first time and was curious to see how things had changed for Alexandra, the model he had swapped genitals with. Jeff was pleasantly surprised to see that Alexandra's career looked largely the same and some of the ads/pinups looked just as Jeff remembered them, presumably a credit to Alexandra's skills at tucking and/or the advertisers' photoshop skills. There was an entirely new line of ads in this timeline that Jeff discovered (and found incredibly hot) of Alexandra wearing just about nothing but the "bulge defining" briefs and boxer-briefs of a men's line. On Alexandra's petite frame, her bulge was particularly well defined and Jeff was surprised he felt a small twinge of pride that his former "glory" was getting such a spotlight. (Jeff was a little less surprised that he had a hard time taking his eyes off such a well defined bulge on such a beautiful woman's frame.)
Jeff moved on discovering that all of his underwear had changed to be sexy and complement his super model vagina. When the underwear wasn't incredibly skimpy (thongs and g-strings galore) it was often super lacy and decorative, and included some interesting combinations of both. Jeff realized he had no interest in keeping it a secret how sexy he was between the legs, that if someone was lucky enough to glimpse his underwear Jeff was going to flaunt how delicate and demure (and hot) it was underneath. Jeff found some thrill in the idea of how visible some of the thong and g-string lines might be above his pants waist if he were to remove his shirt or even just stretch enough to pull his shirt a bit upward. Jeff had heard for so much of his life that a boy's confidence is somehow related to ball size or perhaps even stored in the balls, but now that Jeff had a pussy and no balls he realized he had never felt more confident in his own body.
Even if Jeff had been worried about keeping his genitals a secret, without needing to adjust a complicated jockstrap Jeff spent a lot less time needing his pants down in the locker room. (The school's showers were all private after some lawsuits decades back.)
In sports, without balls of his own to carefully protect from injury, Jeff found himself more confidently taking risky jumps and dives in the games. He also felt less bad about risky other guy's discomfort, without the constant reminder between his legs. His confidence started getting people wondering if he should join one of the school's teams.
In class, Jeff didn't have to worry about random boners interrupting lesson plans and stealing focus. It didn't entirely stop Jeff from exploring some options with regards to new abilities to dry (and wet) hump items available in the average classroom, nor from wondering if he could get away with a discreet remote controlled vibrator during his more boring classes. Yet Jeff was still getting better grades and feeling more confident even with the change in distractions.
In relationships, Jeff found that he didn't have to compete with blood rushing down to his pants when talking with hot girls. (Even when he felt incredibly wet and sticky down below, it seemed much easier to think and converse freely.) He got to know and then found he had no trouble asking the hottest, most popular girl in school out on a series of dates. Among the guys in the school there was no greater sign of confidence than dating the head cheerleader.