Substance abuse is an issue that many people today face, and there is no quick easy answer if you are concerned you have a problem. Being self aware enough to question if you need help is a good first step, but does not mean you need to go check yourself into a three month long rehab program either. Ask yourself a few questions first.
Do I feel like I need it, or do I just like doing it? The answer to this question might also depend upon what drug you are struggling with. After a long day, maybe you like to have two glasses of wine. If that is the case you probably do not need help. Illegal drugs carry risks besides those to your health. If the legal and health risks are not enough to dissuade use, then you may have a problem that warrants seeking treatment.
Do I feel guilty for using, or do I lie and try to hide my drug use? If you feel guilty, there is probably a reason. If you are lying to your family, it shows you know you are doing something wrong.
Does my drug use lead to destructive behavior? Destructive decisions are going to be defined differently by each person. Getting drunk the night before a test is a destructive decision for a college student, but may mean you need to be more responsible. Getting drunk or high then missing work and losing your job means that you need to seek help. Consider what your substance abuse does to your family as well.
Am I using drugs regardless of the consequences? If your drug use has resulted in arrest, risk of failing in school, loved ones to stop speaking with you, or loss of employment it is time to take a good long look in the mirror. If you are continuing to do drugs even though it is having a negative impact on you life, you need to seek help. There are several options to help people with substance abuse trouble, find one that will work for you.