How to be comfortable shirtless?

I'm a 16 year guy and work during the summer helping do farming. It gets really hot and I want to take my shirt off but I'm not comfortable with people seeing me shirtless. My chest is kinda pale so I need a tan but need help on doing this so any tips will be a big help. O and what should I do with the shirt when I take it off?
How to be comfortable shirtless?
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