I walk like a duck. HELP!?!

I walk like a duck. HELP!?

I have searched for the answer to this question and have found a few questions similar to mine but the answers and signs are different from mine.
I mean,i do walk like a duck...
but i have a good posture,i go for yoga classes,i make sure that my feet are straight when i walk or run. i'm quite sure i dont have bow legs or something like that.
this has been a problem since i was in kindergarten and my mum only pointed it out to me before i started high school<12yrs old>.
none of my friends said anything when we were in primary school so i didn't know i had a problem.my mum told me some ****ing kid was laughing at the way i walk when i finished school one day when i was about 9yrs old.
this problem had caused my self-confidence to plunge consideratedly and it took my years to get back to where my self-esteem level was.I'm 15 now.I used to feel VERY uncomfortable whenever i walk because some ppl will stare at me or something. i still feel a little uncomfortable whenever i walk.HELP!!

4 weeks ago
and i'm not overweight.
My BMI is 19.

make sure when you are walking you concerntrate on balencing out your body weight evenly on each side of your legs, make sure your head is facing straight up, both of these thing will become natrual after a lil while, don't eat/drink too much sugar because it throw out self balence levels (has to do with your brain and stuff) and mae sure your feet out paralelle not turned out! and don't feel uncomfortable stuff the ***ckers that are laughing. hope this helps