I understand what you mean. You could always meet someone that made you feel your life is so great that you don't even need to change something like your height, althought it had been a high priority in the past. Not my case, though, so I can't tell. But I have always felt more secure about myself and cared less about certain things when I had relationship with a person that made me feel my life "complete". Also, the more tied you feel to your current life, the less available you'll be to do the procedure, and viceversa. Basically, unless you have a very tolerant, open-minded person in your life (or he/she is also into this, lol), you're better not bound to anyone until you've made every change you need in your life.
So you can basically choose between two paths, changing your life or accepting it. If you choose the second one by relying on another person, you will be vulnerable, and if that person ever leaves you, you'll be completely wrecked and you'll have lost a lot of time. Staying away from any of those things on purpose makes me feel empty, which feeds my will of doing the procedure. So yes, I do feel I really need this when I'm depressed.
Cheers.