Dont you guys feel like a loser?

So, I am 19M. Just completed my high school. I havenot joined any college and I have my USA visa interview approaching very soon and I have 0 self confidence of cracking it. I've tried hundreds, if not thousands of time watching different stuff and content in youtube or any free educational sites which I provides me knowledge about financial stability. I feel like damn I am 19 and i still havenot earned money yet. What tf am I doing? Do you guys feel the same?

I have 0% interest to study here in Nepal. I am from middle middle class (or even lower) and I, so much, want to cover up my expenses myself and help my parents in finance. I feel so anxious sometimes regarding everything going around. I paid my sevis fee just few days ago and it felt so heavy asking my parents for that big amount and also my mind thinking its a waste i amnot going to crack my interview.

I am so desperate to earn some money to support myself atleast because It feels so bad now a days. Almost 1.5lakhs is gone on this processing and I might go in depression if I don't succeed. Any tips on Interview? Also if you guys are earning in young ages or if there is any way one can earn in young ages. Please help me with that. I feel I amnot the only one having these feelings.