I hate being naturally thin😓😪

It's bad enough that I have to wear these stupid booty pads an push up bras I hate showing my arms and I hate showing my legs. I do eat 3 times as a day and as much as I can but it's super hard. I'm only 4'9 and I weigh 84 pounds. I can't even be happy about my body when my boyfriend is around I get so insecure that sometimes I have to cover myself I'm disgusted. I asked my doctor she told me your not tremendously under weight just a little bit but I'm not anorexic or sick looking but still I get depressed about it I've been like this my whole entire life I wish I was those girls with a big booty or a firm one an bigger boobs. I'm not super flat chested but it still bothers me. I hate looking like this I can't deal anymore I don't know how to love myself.