life anxiety

I'm 16 and I just feel like I'm falling behind in life right now. I'm trying my best to live in the moment and not stress or overthink about the future, because I do that a lot, but it's really hard when I'm just quarantined in my house 24/7. I feel like I'm just wasting life and I'm falling behind, while everyone else is doing great and leaving me behind in life. I hate this constant feeling that I'm wasting my life or I'm not doing enough in my teenage years to make the most of it. I just don't know how to do that when school is gonna start again and there is nothing to really do. I just don't want to have this feeling that I'm missing out in life, being left behind, I'm wasting life when I should be doing something, but I don't know what. what do I do to stop this feeling? I want to be in the moment and live life to the fullest, I just don't know how. it's causing a lot of stress and anxiety just thinking about it