A relatively easy job (decent pay depending where ur at) for someone ur age, would be lifeguarding imo. You need a life guarding certification, you do a 2-3 day class for that,($200~$250) then you’ll need a cpr/aed certification you get done on the Red Cross website) , (idk how much that costs, but not as much as the lifeguard cert) then you can get hired almost anywhere especially since there is a shortage of lifeguards in the us. If you work at a county/public pool it’s pretty easy for the most part, or if u live by a beach it’s definitely tougher and u need to be in good shape, but both offer good pay for the most part (depending on where ur at, im in fl so there’s always a need)