Don't feel forced to change your personality just cause you're presenting male now. There are both men and women with all personalities. I'm pretty big into Myers Briggs Theory, and if you're an introvert, don't try to force yourself into becoming an extrovert just to fit in. It won't work and you'll make yourself very unhappy by constantly fighting your nature. And it's unnecessary. In fact, a higher percentage of males tend to be introverted than females. I know it's an extroverted world out there and a lot of people try to make it seem like extroverts have a better or more desirable personality than introverts, but you can be perfectly confident in yourself without feeling the need to talk to everyone and be outgoing all the time.
If I were you, I'd try to find out my natural inclinations (take some personality tests and do some soul searching-- pay more attention to what your natural tendencies are, what makes you feel happiest and most comfortable, etc) and then embrace and develop what you find. You're going to get self-confidence from being comfortable with and embracing who you are, not by attempting to change who you are personality-wise. Once you're confident with yourself, that'll shine through-- whether you're introverted or extroverted.
That also goes for Thinker/Feeler. The vast majority of females tend to be feelers while males closer to half and half with slightly more thinkers. So when females socialize, they're much more likely to bring emotions into the picture. But again, a little less than half of males are also natural feelers, so it's not like all females are feelers and all males are thinkers. Find your own natural tendencies and then go from there. If you're an introverted thinker, you're probably not going to be bubbly and you shouldn't feel the need to be. Just be yourself. I would even suggest, once you've delved in and found your personality, to look at some message boards for that personality (personalitycafe is a good one-- that's what I'm on). There'll be a whole bunch of both guys and girls there with your natural tendencies talking about how they interact with people. You can even post up questions about it and they'll respond with your inclinations in mind instead of just telling you how they believe all people should act. It's a good resource. I learned a lot about how most ENTP guys interact with others and I've found it to be very natural and comfortable to steer my interactions in that direction because those are my natural tendencies. You could even start of conversation like "XXXX guys vs girls" and ask for opinions on the differences and no one will think twice about your motivations for it. In fact, I've seen many such topics on the board.
