Growing up isn't all bad! Maybe you think you won't achieve these things, but you can do it, and that's coming from someone who was in the exact same place as you are 2 years ago. Trust me, it'll all be fine. You just gotta think about the positives of growing older; making more, closer friends, meeting somebody and eventually having a family, following your own career and all that jazz. Just don't overthink it right now.