Although one’s “root cause” of low self esteem could be different from the person next to them, whatever caused it resulted in a negative self-image. Whether it is the result of not meeting real or imagined expectations, comparing yourself to others, a lack of praise or love from others in life, continued struggles that you can’t figure out how to overcome, or something else entirely, it can have a real impact on your entire life and you aren’t “wrong” or “weak” because of it. Whatever the reason, it’s valid.