If you were born between July 18th and August 15th, you were born with Sun in Cancer. When the Sun moves into Gemini, it creates someone that places a lot of emphasis on stability and reliability. The sign of Cancer represents emotions, intuition, nurturing others, the mother, and an emphasis on relationship with those around them. The sign of Cancer is a homebody by nature... they derive a lot of happiness with cooking and "nesting"! On the flip side, they can also be considered to be manipulative and clingy at times. 
To see your own personal chart, you can search a "vedic chart calculator" or email me at [email protected] and I'll be happy to send you your chart. For understanding where this is happening in your chart, you can visit innerknowing.yoga and click on "north Indian chart" to see where Cancer is in your birth chart.