Developmentally, you may be experiencing the “identity vs. identity confusion” stage. According to Erik Erickson’s psychosocial developmental theory, this stage generally occurs in one’s high school years. At this stage in life, individuals are attempting to find their own identity. This involves trying to fit in with other people, joining new groups or trying new activities. It is completely normal and healthy but it is can also be confusing and disconcerting. Generally speaking, being a teenager is difficult. That seems to be a universal experience.
What is needed more than anything in this situation is an objective third-party perspective. I would highly recommend seeing a therapist. A therapist can evaluate your situation and gauge your “normalcy” relative to others. A therapist can also provide guidance regarding social interaction and teach you how to successfully navigate the tumultuous teenage years.
If therapy is not an option, you could try other activities such as journaling or becoming involved in a hobby at school. Many people find journaling to be a therapeutic activity. Having a written record of your thoughts and feelings can provide valuable psychological insight. Beginning a new hobby is often a great way to connect with other people. Connecting with your peers can help to decrease your negative feelings. I wish you the best of luck.