Idk what to put here

Im soo frustrated with school and my life like im a slow ass learner and once i really get the hang of something im learning we have to move on and my grades aren't really that good... plus my high school is so bad and i dont know what to do with my life. Honestly i think id be better offing myself once i graduate. I have a few ideas of what i could do but im not sure if it would work out. I'd like being a dentist. I like dentists but my mental health has really been affecting my grades for the past 3 years and i Honestly think i have some kind of undiagnosed learning disorder but fuck it we ball!!