Hard to say. For me it was the feeling of emptiness, apathy, lack of motivation, loss of interests, not being able to think clearly, social isolation and not ever wanting to wake up again that made me see a T at one point. Having some symptoms of depression doesn't necessarily mean you have it. A therapist might give you a diagnosis, but it's still kind of uncertain.

If you have symptoms which you think could impact your life, then something should probably be done about them.