You don't.... ..Unless there is an underlying cause, which is possible if this is a new development. Various medical conditions (e.g. Cushing's disease) or over-application of steroid creams, can thin your skin. But if you were born with translucent skin, that's just the way your skin is, and that's okay! Pale, silky skin was much admired in victorian times. It's a part of you, so celebrate it!