I am not overweight and only in my mid 20s Ever since I was little I've had these neck rolls. What can I do to get rid of them

Neck rolls are typically from localized fat collection in your neck. The reasons for this are multifactorial - for example "runs in the family", related to your weight, hormonal, congenital,etc. Liposuction using fine cannulas are very helpful for this. If loose skin is an issue then some non invasive treatments like Ultherapy, Thermage, Thermi-RF, or the Sciton Laser BBL SkinTyte are good options as well

"Injecting soft fillers like Belotero in this area can reduce lines, wrinkles and folds as well as improve skin texture with long-term collagen production. Fillers are being used more frequently to contour and lift rather than solely line fill. Of course, fillers are best used in combination with lasers and microneedling​ with PRP to get the optimal outcome.

I suggest getting a formal evaluation with a cosmetic dermatologist to create an individualized treatment plan that works for you. Best, Dr. Emer"

You are completely correct that this is not due to weight. It is likely due to genetics. Some people are genetically predisposed to having a double chin, and diet and exercise will never eliminate it completely. One procedure that could help would be liposuction of the neck to remove the fat and improve the contour to reduce the appearance of the lines. Liposuction is performed with tiny cannulas inserted through small ports or “dots” behind your ears that no one will likely see. Sometimes I also inject your own fat into the lines (the areas of depression) to further smooth out the contour. I recommend consulting with a board certified plastic surgeon in person to discuss your concerns and to determine if neck liposuction is right for you.