OP, I think you look great on your little pony. IMHO, the temperament, training, and heart are a lot more important than height. Why trade in a great little horse that you love so much just for the sake of vanity. The horse that you may (or may not) look better on may not fit you as well as the pony does and you may not enjoy riding them as much.
IMHO, so long as he's not having trouble carrying you (which won't happen for many years as tiny as you are), then you're good to go with your little pony.
Heck, I fell absolutely in love with a little 13.1 hand pony I rode for some customers last summer (I'm 5'5 and weigh about 130-135). He could carry me all day long working cattle and still had plenty of spunk at the end of the day. I rode him many days for 8+ hours in a feedlot and I even roped off him. I left a standing order with his owners that if they ever have to sell him, I want first dibs.
Cant see the video because I'm on my kindle, but I regularly ride my 13.2 hand pony and Im 5.7. As long as you are well balanced and aren't over about 20% of the horses weight you should he fine. Now if you are doing high speed / impact events like jumping or barrel racing you may not look as together and you may have problems steering correctly if you have long legs like me, or your upper body could slightly off balance your horse (but again as long as you are a good well balanced rider you're fin)
Thanks guys :)
He's the best pony I could ask for :) Not perfect obviously, but as close as it gets... At least to me :)
I don't ever want to sell him! And according to my weight and his weight (about 880 last time we weighed him.. to 105...)... I'm at 11%... I think we're safe weight-wise!