I use both hands, but I am not ambidextrous (i.e. I generally cannot do any one thing with both hands).
I eat, write, and baseball bat left-handed. My fork is always in my left hand and my knife always in my right.
I throw, kick, mouse, use scissors and dribble and shoot a basketball right-handed (I use to mouse left-handed, until I had to share a computer with three righties in college. I also have memories in pre-school of needing left-handed scissors, but that was gone by the time I was in kindergarten. Though I dribble right-handed, my left-handed is dribble is very good.)
I now bowl right-handed but I bowled left-handed in my pre-teenage years.
I shoot a pistol left-handed, but I shoot a rifle right-handed. I am left-eye dominant.
I play tennis mostly right-handed, but I will often use a forehand on both sides and no backhand. I serve right-handed. I play racquetball right-handed (wrist strap prevents switching). I can only play badminton left-handed (I do not have a lot of strength in my shot that way, but I do not enough touch in my right hand to play well).
BTW, despite being so screwed up, I played three varsity sports in high school (I was a left-handed batting catcher and a 3-forward with a nasty cross-over dribble).
Finally, I "identify" with being left-handed and like the relative uniqueness of it.
MotionMan