Why Do I Get Easily Tired From Playing Sports All of The Sudden?

I'm very frasturated. ive been playing sports all my life last month i made it to my high school basketball team. I left team athletics for about 2yrs only but i still had physical education - which i did my best on. during the whole basketball think i realized that the bones (my tibia) would start aching, so will the bottom of my lungs and the bottom of my stomach. I also started getting super tired and out of breath very easily which made me completely slow down and have the coach picking on me in front of my team. when i was two yrs younger, i played much much better than i did now and its really frasturating me. I kno how to play really well but suddenly my endurance and energy disappeared. this very summer i was playing tennis 3x's a week for 4hrs and now suddenly out of nowhere im feeling like an old grandmother. i dont smoke, do drugs, or drink. 2hrs before i had practice i had a little bit of baked meat and two banana's. can you please tell me what's wrong with me?

btw im 15, turning 16 in 3 months.
 
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