The short answer is that you are a seemingly very outgoing and lively person, who is more severe than most people suspect.
The Gemini Sun means you are intelligent, interested in many subjects, and always hungry to learn more. You are up on the latest trends, and most likely read, have a blog, or go to the movies to keep up with things. You are restless and can't always turn off your mind, and this can lead to stomach issues. You need more quiet time.
Aries Rising represents the way others see you. Aries is a fire and leadership sign, so you set the tone for the group you are in. You have original ideas and are very inventive. You have a temper, but the Capricorn Moon mitigates that a little. Aries is a sign of friendliness and fun. You start things you don't finish, but again, I see your Moon sign interfering in that. You blurt out things you don't mean when you speak at times. Even if you are angry, you are fast to forgive.
The Capricorn Moon rules your emotions. You want security and are family oriented. You are more conservative than you seem. You have business ability. You are very emotional, but may not show that unless you really know the person well. You plan ahead sometimes, but the Aries in you has no forethought, so there's a conflict there. It would depend on the subject or how much you care. I can't tell without a whole chart. As you get older, your emotions will lighten up a little. You have a streak of taking life too seriously, although the Aries and Gemini help with that. Capricorn is another leadership sign, so I think you will accomplish your goals.