It's unclear if you fear (A) starting an antidepressant because your body will become dependent on the medication, thus making it difficult for you to stop the antidepressant, or (B) if you fear seeking evaluation because you may be advised that you're a good candidate for long-term treatment with antidepressant therapy.
If you fear (A), fear not! Although antidepressants can cause discomfort if improperly discontinued, a skilled clinician can discontinue any antidepressant with minimal or no discomfort to the patient.
If you fear (B) above: whether or not you remain on medications long-term is--firstly--your choice. A psychiatrist's job is to educate you about your illness, as well as the potential risks and benefits of various treatment options (including no treatment), then to help you decide upon a course of treatment. No one should pressure you to decide either way.
The likelihood that a given patient will need antidepressant therapy long-term depends upon several factors. One factor predictive of a need for long-term (sometimes lifetime) treatment with antidepressants, for example, is the number and severity of mood episodes that have occurred in the past.
A very general rule of thumb for depressed patients, for example, is: if a person has had three or more major depressive episodes, they are likely to do best on long-term medication maintenance treatment. The data is very clear regarding these patients: those who do not remain on maintenance antidepressant medication have a high likelihood of having additional--and often increasingly disabling--major depressive episodes in the future, with each major depressive episode predisposing that patient to additional future episodes, sometimes worsening in severity.
Not every patient diagnosed with depression is an appropriate candidate for antidepressants, as many patients are more suitable for counseling or therapy.
I hope that helps, and I wish you luck!
Again, that is a very general rule of thumb. Only after a thorough evaluation and discussion with your provider can a reasonable outlook be formed and appropriate treatment recommendations made.