Densely packed. need help

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Hey,
my name is Kelley, I am 21 years old and for all my life I have been "overweight" I have been the most active in my entire family, being varsity track4 years, show choir 2 years. and being a scholarship athlete in college for track. I also have played rugby. I played softball my entire life, played soccer, volleyball. I just like staying busy and I love sports.
with all of that you would think that I am of average build, no I am 300 lbs and 5 foot 9. however I wear the same clothes as someone that weighs 40-60 pounds less than me.
if anyone has any tips for a densely packed female to lose weight, ill try anything right about now.