I would suggest you not to as to further damage you broken collarbone. Wait at least a minimum of 4 weeks where the healing has already taken place before you go sitting in a hot tub and risking an accidental slip and going back to square 1
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Because, as an adult, they might have more experience dealing with that problem or they might know who to call or what to do. As a teenager, you have a very limited and short experience with the world and you might not always have the right idea about how to do something or any ideas at all. Plus, that's just what adults do.
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To get better at muscular endurance you have to push your muscular endurance by lots of reps with difficult exercises. First gain muscle and then use your muscles a lot in the weight room or gym. Over time you should be gaining muscle and you can track this by the skin fold caliper test. Do this every week or two and you should be seeing a change in your numbers. To track your muscular endurance, you can write down your reps and amount of weight and track this once a week as well. This will also help you see the change in numbers and hep track your improvement.