Go to guidance, and ask them to pull a copy of your full high school transcript. Look at your grades from each class. Make sure they are correct, and that you understand why your overall GPA is what it is.
Talk to guidance - make sure you're on track to graduate. If you are not, talk to them about "credit recovery", where you can make up for any failed classes.
Think about why your grades are so much lower than where you want them to be. Is there anything you can do to try to improve them? For example, if your attendance is poor, can you improve your attendance? If you tend to miss assignments, why do you do that, and is there anything you can do to try to improve that? If your grades in certain subjects are poor because you don't understand, can you arrange to get extra help? Take control of this. You have some power here.