I think you're okay.
Note: I am not a doctor. But I've been a teenaged girl (it's been a while
These are years with changes, ennui, angst, anxiety, a little bit of this and a little bit of that. They do pass.
In the meantime, know that there are other people who are likely going through similar emotional issues. You're not alone; it's pretty normal to be kind of all over the place right now.
Knowing yourself is huge at any age. Might I suggest either art or diarying? You may find either a relief and a record of how you've been feeling. They're constructive ways to address your feelings. Exercise is another constructive way to handle how you feel. Listen to music, talk with friends, etc.
And you can just have a good cry at times, too. There's nothing at all wrong with that, and it could bring you relief.