I don't think anyone (guys and girls) are better or worse, more or less value just for being skinny/fit/in shape/chubby etc... I think you should just be happy with yourself and be confident and not worrying so much about how attractive you are as there are more things than look that is attractive to people.
I am 6'4 and 270lb (Not much muscles) I am still quite attractive and popular but not everyone ya know.
Don't worry too much about what boys like. You're so young and you'll find the right guy for you sooner or later.
As for your weight, look at it as more of a health issue than anything else. Your doctor will be able to tell you what weight range your body type should shoot for, and he/she will also be able to tell you how your body's doing internally by drawing blood and running tests on it.
Girl be YOU! if your strong thats good! and She- ra is a cool nickname! Was major hit cartoon from the 80's have you seen a picture of "She-Ra" look her up, being compared to She-ra regardless of whether she is a cartoon or not, she is fierce ;) and to my understanding Guys Love curves, but Im sure you were going more for guys opinions on this.
Im not trying to be mean but I feel like I should answer this honestly. Being 5"6 and 210 is not chubby thats over weight maybe even leaning into obesity according to healthy weight statistics. I think you should start eating healthier and doing something that involves excersise to get down to a healthy weight and life style
At your weight I'm pretty sure your considered obese. Guys in high school typically don't go for girls who are chubby. Also 5'6 is not tall at all. I was 5'7 in 8th grade. I don't mean to be rude but my mother weighs a lot less than you and I personally think she could lose some weight (she's not fat but she's not skinny). You should start eating better and exercising because their can be serious health risks in the future.
5'6" and 210 is pretty large. You can still be very strong and lose a lot of that weight. Some guys dig larger women, but I think most don't so you are really narrowing down the dating pool. Sorry, and best of luck!