How do I stop having a fear of becoming a failure?

I’m not doing good academically and financially, I’m only 18 and I have to retake my classes in order to get into uni. I can’t stop comparing myself to people my age, I want to become an engineer but I don’t think I’m good enough at certain subjects. I feel like I’m wasting my time away…

How do I stop having a fear of becoming a failure?
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