Yes, I'm 27 too, overweight and have gained more since quitting. I also suffer with depression and anxiety, I have no friends and left a good career a few years ago. BUT we are both in an infinitely better position than we were when using. I have 7 months sober now and while I still struggle with insomnia I am so much happier. I no longer have that desperate desire to drink. Please know there is always hope and things will get better as long as you stay sober! You have already helped yourself and improved your situation by simply becoming sober.
Take care of yourself and love yourself! :-)