Why dont i feel pretty anymore? HELP PLEASE :(?

ive always had a problem with feeling pretty but i had recently starting feeling more confident but now i dont my boyfriend family and friends all say im crazy but im so worried about my weight but i haved gained but 2 lbs then ill lose it, its kinda like its water weight and i notice it most after cheer practice but i just wanna feel pretty again bc by not i am worried my bf is thinkin im not pretty and he tells me all the time just randomly im beautiful even when i dont have on make up so why did i stop feeling confident?