Again, zodiac signs and mbti types are not expected to correlate (for whatever reason). This makes astrology unreliable, but not worthless.
Gemini is characterized first and foremost by hyperactivity and fickleness, they come off as immature toddlers, as it seems they never lose their old ways. They are intellectuals (though not in a way that NTs are; they loathe lengthy, impractical and pretentious theorizing), youthful, persuasive and tend to always show signs of nervousness (constantly checking phone, tapping foot, shaking leg, sighing and looking stessed). They can also be highly gifted in the arts, though curiously they seem to never practice yet always show some talent and skill. They have a need to always be doing something and when that something gets old they look for something new. Geminis live in the physical world, always searching for the next best thing to stimulate them physically, if lucky, intellectually, and sometimes even sexually. Geminis are more likely to use stimulants and inhalants to give them the rush they need. Their main goal in life is to find out the world's mysteries, the more dangerous the better. The saying "curiosity killed the cat" was no doubt meant for a Gemini. Geminis are most likely to be found in sports such as football, basketball and tennis and in the arts as musicians, painters and drawers. Now does that seem like ESTP to you?
It may seem like Ne, but Geminis do not live in the present mental realm, they live in the present physical realm (Se). Though, they are always planning for the next great adventure because of their need to be constantly stimulated. Their weakest area is realizing the implications of their actions (inferior Ni) and a sense of how situations will turn out (this is why they tend to dangerously live life in the fast lane). They love to philosophize (auxillary Ti), but only about subjects directly related to the physical world. They love expressing emotions through carefully chosen words, art and music and give off a jolly and upbeat nature, but would rather not handle the dirty work of addressing feelings (tertiary Fe).