i was sitting with dad today and saw this girl with knee length hair go by so i told dad i had to go for a min so i walked up to her when i saw her again on other side of store n told her she has amazing hair and that im im growing mine out that long too so we chatted a while(5-15 mins) about hair n as i was walking down asle next to her i heard her say that was weird but cheered her up she was witrh her husband(who also had a pony tail but was gonna donate it ) so i was happy i was shaking walking up to her while she had her back to me n i stuttered at first when i statted talking(my first time giving a complament) it was also only time i saw knee length

as im 16 i thought id just look like a creepy teen but

Good for you!  It is a real shame that we find it difficult to compliment strangers.  We obviously need more practice.  I too, find it easier to just give a quick compliment as I'm passing by.  That way the person receiving it does not have to feel obligated to chat or even respond.  A smile and maybe a thank you is the usual response.