How can i change my ways and reinvent myself?

all my life i've been the fat ugly kid and i really want to change for myself. I am about 5'8 and weight 176 i'm going to a new school next year i'll be in the 10th grade and its a private school so i wont know anyone there so i can reinvent myself. i have blonde hair to about my shoulder and dark blue eyes, i'm also really pale i'll work on that this summer. I usually only wear mascara and some powder to hide my blemishes, and i only wear jeans and t-shirts everyday and sweatshirts too usually with my birkenstocks or some converses i'd wear tighter clothes but i want to lose the weight first. So how can i be prettier and change my ways and make more friends? even boys? i'm really shy