Since you are young, no point in trying to dissuade you from making all of the mistakes.
After everything fails and before you give up, remember that some dude online told you once that obesity wasn't your fault and that it is completely reversible.
Maybe save this answer if you are able. Revisit it in a decade or so. Hopefully not after you feel like a failure because you were lead astray.
The answer is not just weight but FAT weight and likely 25-35lbs OF JUST FAT.
This is science, a word that many now seem to mistrust. Biochemistry, in fact.
"Sugar: the Bitter Truth " on YouTube
"Fat Chance..." by Dr. Robert Lustig M.D.
In the next decade, this new science will probably start to be taught in medical school.
Watch the movies "Fed Up" or "That Sugar Movie" to get the general idea. My sources are if you want the minutiae.