Are you smart but lazy?

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Are gifted with a smart mind, but you sometimes can be lazy with things like homework or other things? This is a discussion for you.

In all my years in schooling up until 8th grade, I had been top of my class and an outstanding student. In that year my classes were shared with other kids in my grade who had not had the good habits I had and didn't necessarily merit terrific grades. While I spent the year with them I had partially lost my habits and a mindset had overcome me-"Settle for average, or something along those lines." Because most of my friends are happy with 80-85 grades I was like well I should be too. Ever since then, I had been a bit lazy and I missed out on honors classes in 9th, 10th and so far 11th grade because of it. However I am in advanced math for my grade, (taking Math 12 as a 11th grader). I kick myself in the butt everyday because of this and I don't know what I should do. College searches are starting and I need to get myself back on my horse. I just feel that I had made a big mistake and I should really turn this around so I don't f-ck up my life before it even starts.

Any discussion or advice is welcome.