You can say just that - "I am a social person."
OR
"I'm good socially."
Sometime we also say "I am a people person."
2013年5月3日
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I am no wall-flower.
2013年5月4日
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"I'm a sociable person." or "I'm a very extroverted person." (from Jungian theory), or simply "I really like people." or "I'm a people person." Those are some ways.