Oh, that's not bad! (Probably because I am a tight 18 too!!)
I sound just like you. Stopped smoking when I found out I was pregnant and replaced fags with food. Went from a size 14 to a size 20-22 at my largest. Heaviest weight was 15st 13! Am now 14st 7Ibs but need to lose weight as I'm sick of feeling so down in he dumps. I dress like you do too. Baggy and ugg style boots. Nowhere to go out either.
Those boots will remind you that you are great and that life is there to be enjoyed. Let them give you that boost to make you see that you can stand out from the crowd for all the right reasons. Hold your head up high and walk tall in them!