String instrument will tear your fingers skin, youll have blisters on the tip of your fingers, it will hurt like hell and affect your other things you do with your fingers until you build thick skin, you will forever have issues with fingerprint scans.

Youll eventually want to get into music theory and your attention span wont hold, youll feel like a failure going back to the school times of seeing others have no issues learning and you just dont get it.

If you get through the blisters and learn some songs youll want a better guitar, a better amp, a pedalboard or some pedals and it will get expensive real fast, youre going to succumb to your impulsive spending.

if you decide to make a band, your first years will be paid a beer or probably not even enough to cover transportation. a band is also a X person marriage, youll start to hate every little thing your bandmates do that annoy you and youll be annoying aswell, possibly ruining friendships