Am i fat or just big?

Hey guys, i recently started to try and loose some fat over the summer by going to the gym mon-thurs and playing airsoft all day saturday. however after 2 weeks, its said i gained 2 lbs... i was never a lazy person who never did anything, i played ice hockey all my life and soccer, i can run a mile without stopping, and do many other athletic things. im about 6ft and weigh 220 lbs. i feel thats entirely too fat, and when i compare my Body Mass Index to my Height, it claims in obese... which is crazy. i wish i could show you guys a picture lol but i feel like im just building muscle and thats the reason im gaining weight from working out. Also i come from a family with large leg muscles and can bet you that each leg weighs 50-75lbs lol.