I‘m so tired. And I don't know if students in other countries feel the same as me?

I'm a senior student. And I am going to college next year. Before that, I must pass the entrance examination for college. I do know that if you want something sweet (hmm, it would sound better if you used "good". I think you mean, if you want a good outcome or if you want something good to happen. And we don't usually use sweet like this. It sounds more like slang a little. Like when a person says "sweet dude!" haha), you have to get through the thistles and thorns...But I'm so tired...I cannot find the meaning of life. I really want to do something meaningful.