Doctor Help

So, not gonna lie, I'm not okay. The goodish thing is, I realize that and I'm going to the doctor.

I've always felt generally kinda down, but sometimes it's just worse, but it's just way worse recently. Idk why. I finally decided I'm going to make an appointment, however, I'm not sure what to say. I'm a college student, so I have to go to the clinic on campus, which I've only gone to one other time. Idk what to say when making the appointment. I dont feel comfortable just saying the truth in front of a bunch of people. What do I do? Please help