

Myopia/nearsightedness is one of the most common reasons for needing glasses or contacts. The happy people you’re seeing online are most likely ones who only needed their distance vision corrected anyway (assuming the reviews were written by actual humans). I have farsightedness/hyperopia and astigmatism, and I’ve never really considered Lasik for similar reasons to you.

First of all, I agree with the other commenters about getting assessed for a learning disability and/or ADHD. Your post is more coherent and well-written than a lot of stuff by people with degrees, and you were able to do the math to figure out if you were going to pass. If you aren’t doing well in school, then it seems like there’s something else going on there.
Second, you might want to check if there’s a career center or something near you. If it turns out you do have a disability and you live in the US, there’s a program called Vocational Rehabilitation (voc rehab for short) that can help with career assessments and such. If you’re not US-based, other countries might have similar stuff; try searching for voc rehab or occupational therapy.
Third…you school only gives you seven hours to register for classes? That seems insane to me. Is that standard anywhere? Maybe your schools just suck, lol.