Am i getting too fat?

my frends an family hav ben subtly hinting tht i need 2 lose weight!!! i play sports but i didnt do softbal this year and i dont think its from musle. when i sit down i have two rolls of belly fat and it spills voer my pants. but i sthis still bad becuz i do sports?! i am 150-153 range and 5'4". i ama lso usually size 9 jeans but i went to buy some shorts 4 the summer and i cant even breathe in size 11! so am i getting fat and wut should i do to loose th weight?!