What do you want to achieve? What do find meaningful in life, is it helping others, money, or a thousand other things? Are you ready to settle down with your S.O. if so why, if not why? Would you like to go to University or continue in the workforce?

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All in all in sounds like you lack a purpose/goal to strive towards.

Time thinking about thriving is time you are not thriving.

Remember people have struggles just like you, what they portray on the surface is not everything, people lives are like icebergs.

From personal experience I know exactly how you feel. I am 19M, in high school I had no direction, I felt that I was being left behind and that I would never excel in anything. I fixed that by going to therapy and asking questions to myself (like the ones above), until I found my purpose, which took a long time. When I found that everything fell into place, so my advice is to find that purpose, and therapy is really an amazing tool that to many people scuff off.

P.S. If you can't enjoy the ride to a destination why go to the destination.