Belly after Twins?

So my twins are 7 now... I was 120 lbs when I found out I was pregnant. I'm 5'3. I gained 60 lbs with them.... Now I'm covered with stretchmarks, from my calves to my breast, but my stomach is aweful. I have excessive skin and very self conscious about it (or I would show you a pic)... So I was wondering, what have you twin mamas done to help your skin tighten back up or help your stretchmarks fade some...I've never been able to get back down to 120 lbs BUT I would like to wear a two piece one day and feel comfortable, and I havent wore one in 7 years (Luckily they make monokinis now). I was doing Yoga one day (upside down) and my shirt came up and this kid pointed at my stomach and looked at his mom and said "OMG! WHAT IS THAT!" I was so embarrassed. I just want to feel pretty again.