Should I go to a Psychiatrist?

Hello, I'm a high school student from Indonesia and I'm not sure if I'm depressed or just sad. I mean, I think I've been feeling down or worthless ever since I entered high school because of how people here are different. They're smart, talented and confident about it, unlike those in my junior high, and I guess knowing I'm not 'special' anymore makes me feel worthless. Suicidal thoughts come and go, but what really bothers me is the fact that my grades are slipping because I simply can't focus, thinking little activities to do are chores, getting easily overwhelmed, getting frustrated, lost interest in things I used to love doing, one minute im laughing and the next i'm back feeling down, and so on. I would like to see a Psychiatrist but i'm not sure if my problem is serious enough. I don't want to make this such a big deal, I thought if I pull myself together I'll be fine again but I don't think it's helping. So, do you think I should see a Psychiatrist?