@ChattyFibre,
Ah sweetheart, I thought you were on the young side.
You know when my daughter was around 14 years old, she was also questioning herself a lot and thought everyone else was better, had a better life and she felt insecure. It's perfectly normal for young teenagers to go through these stages. You are not alone, many of your peers have the same anxiety, same insecurities and same fears.
Just like you, they have to overcome these feelings with the help of their parents, friends or whomever they choose to talk to. These people can help you and walk you through your concerns. You only have to open up to someone and trust someone enough to help you.
As I said, you can talk to us here, we're always good at listening