How to gain weight for girls

Have you spoken to a doctor about this? You might want to see a Nutritionist, they are trained to address problems around eating and diet.

I did when I was younger ( about 10-12) but all they told me to do was eat more . They told me I was perfectly healthy . So I'm not sure what to think . Maybe my body is one of those types that doesn't gain weight . I've been 85-90 pounds for the past 10 years

Oy! "Eat more" sounds like frustratingly useless advice, especially from a pediatrician.

My advice is to go back to a doctor now that you are an adult. A lot has changed in the past 10 years; now your doctor will take you seriously (and if she doesn't, you can go to another doctor). You may find it helps to work with a nutritionist.

There is also the possibility that there is an underlying problem in your metabolic system... and it may have been more difficult to pick this kind of problem before you went through puberty. I don't really know what I am talking about... but my main point is this...

You should talk to a doctor about this now that you are adult. You can expect to be taken seriously as an adult. And at the very least, you can get help with diet from a nutritionist.

I agree with Max. If you're 21 and underweight and haven't gained any weight since you were 11 years old you definitely need to see a doctor who will take you seriously, or refer you to a specialist.

I am 6' and weighed 130lbs from the age of about 17 till around 35. It sucks being skinny, folks always asking if there is something wrong and telling you to eat more.

I started gaining weight when I started doing some strength training (and no cardio). Muscle weighs more than fat, so adding muscle added weight. I boosted my caloric intake using smoothies with protein plus high calorie good for you stuff like almond butter, coconut oil, flax, etc. My challenge was it was so damn expensive consuming a healthy, good for you, 4-5,000 calories a day.

My metabolism has slowed a tad since 36, which is a blessing. IF you are medically healthy, it's probably just one of those things you may have to live with until you get a bit older and your body slows down.

According to the Body Mass Index, at 6 feet and 130 lbs, you were 5 percent under the normal range of weight. However, the poster is 5 ft 3 inches and 88 lbs, making her 18% under the normal range. Her problem is several times worse than yours was, which is why she should consider it a medical problem at this point.

Trying to gain weight is expensive . And I'm a college student with barely any help from my parents . But I will deffinatly go see a doctor and go from there

You strongly need to see a doctor, probably an internist.
And then listen to his or her suggestions about local recommended nutritionists.

Assuming you get a clean bill of health from your doctor, aside from being "under weight", just stay active and eat healthy. A really good friend of mine is about your size, Latina, and tiny. She drinks the meal replacement shakes as snacks just to keep the calories coming in. Avoid sugar, go for protein and healthy fats.

And grin and bare the comments about being skinny. As you get outa school and around regular adults, it gets better!

Fix a meeting with doctor. Make a diet plan.