Overwhelming feelings

So I joined this summer program for school to do some classes and I was doing really well. Now the program is almost over and I have lost all motivation and everytime I sit at my computer, I just want to cry. I hate this feeling, i know its weird, but I actually enjoy school and I hate that this stupid depression is slowly taking that away from me too. I don't enjoy things anymore, I just feel like a lump of clay going through daily life. I just want to cry and scream and sleep and just sleep. I don't know how to tell my parents, they thought I was better and I don't want to disappoint them. I'm just so tired of this roller coaster and the high highs and the low ass lows. I haven't felt like myself in years and I'm just so tired of this limbo feeling nad my inability to just be fully motivated like I useto be. Will I never feel like that again? I just wish I was a kid again before I had to deal with all this emotional complicatedness.