There's a quick self assessment called CAGE:

Have you tried, unsuccessfully, to Cut down/Control your use?
Have you found you become Angry/Annoyed when others try to discuss it with you?
Have you felt Guilty because of your use or because of things you did and/or said while using?
Have you felt the need for an Eye-Opener/drinking/using upon awakening?

Answering yes to one of these suggests the need to monitor/keep an eye on your use. Answering yes to two or more suggests at least a professional consultation is needed.