why so many damn stretch marks on my side/legs

I went thru the same thing at the same age it's normal.. just not seen as normal bc most women like ur self are angry or upset about them so they don't talk about it but it's completely normal. It's not ugly, it's a sign of growth and change, your body is changing so things are going to start looking different, use coconut oil on the ones u have to fade them and use cocobutter daily to prevent more.. of ur not hydrated sufficiently (all the time) ur skin tends to be drier and when ur skin has to grow it'll create marks.. of u drink sufficient water every day, ur skin will be more "elastic" and have lesser chances of stretch marks .. I'm 25 now going on 26 mine used to be bright like yours now they're faded u barely see them unless it's up close you see the "trails" indent/outline but you can barely tell I have them now... and also at 18 I WAS gaining weight and I was so embarrassed like "I don't even have kids and have stretch marks worse than ppl who do" it's normal tho as you get older u will care less about these types of things anyways! Hope I helped u out a little I know how devastating it could be!  

I have them too.. I hate them. I did put on weight and that's why I have them. I've got them on my arms too, though.. I'm starting to panic about my wedding in 4 months, cause they make me so self conscious. 

It's not normal your skin is stretching because you're gaining weight. If you don't want it getting worse I'd suggest eating healthier and cutting sugar/wheat/corn/soy/processed meats/dairy that isn't organically raw out of your diet 

Disgusting* and you don't have to be overweight to get stretch marks.Sometimes it just depends on your genetics. Some people are more prone to getting them than others are. I have them in all the same places you do and I'm not overweight.