Laxative abuse

This is a really embarrassing thing to admit however, I've started abusing laxatives because I couldn't make myself throw up. I feel so ashamed of myself but I literally can't stop. If I over eat I just pop them and the next day I pass all the "weight" I gained.

Is laxative abuse a form of purging? I'm not really a binger. So I won't do huge binges them pop a lax, only when I slightly go over my usual intake. I haven't told anyone, in my real life because I'm too ashamed.