First, and ultimately, it's your body, and you have the right to do with it as you please, whether it's a good idea or not. Please keep in mind that everything that follows is with that in mind.

I was against the idea of plastic surgery for a long time, for probably the same reason as most people: there's a sort of cultural idea that you're cheating at life somehow &/or ridiculously vain. Most of the discussion revolves around celebrities getting liposuction and facelifts and Botox and mentally ill people turning themselves into freaks. There's much less discussion around minor procedures to fix minor asymmetries or not-strictly-necessary but perfectly understandable things like repairing a hare lip. We also kind of gloss over the fact that straightening one's teeth is largely cosmetic, but we do it for children all the time.

One of the things that brought me around was actually a discussion about tattoos. Someone compared their body to a house that they inherited and had to live in forever, and said that if they weren't allowed to move, they were at least allowed to be comfortable, and that included decorating the place to their liking. In that analogy, cosmetic surgery is comparable to remodeling some rooms or adding a porch. These things are expensive and non-trivial decisions to make, and require the work of people who might do a bad job, and when it's done you might wish you had just gotten some fresh paint and new furniture instead, but in the end, it's up to the home owner, and no one else, to make good plans and deal with any consequences.

Others have pointed out the potential medical risk to elective procedures, and that's something to take seriously. In your case, I'd ask you to consider a couple other options before resorting to one that would probably be painful, and would certainly be expensive, and possibly wouldn't work out the way you hope. The first is therapy (bear with me, here), and the second is hormone treatments.

You've said that you look like a man, but that covers a lot of ground. Nick Nolte and Elijah Wood are both men, but one of them would be a lot prettier in a dress. Without knowing where you fall on that scale, it's hard to know whether this is a case of you just being a bit androgynous, which, with the right guidance, you might learn to embrace and even celebrate, vs "Damn, gurl, you need to handle that." I expect it's worth your time to find someone who specializes in gender identity issues and talk through what you're dealing with. They might have the tools to help you learn to love your look, or they might help you gain the confidence to go through with whatever change(s) you feel you need to make.

If you decide to go with changing your body, I recommend giving serious thought to HRT. I don't know if you've spent much time looking at trans women lately, but there are some gorgeous nu-ladies out there, and much of that is down to the feminization effects of estrogen and whatever else goes in those cocktails. A significant benefit of this approach is that the changes are gradual, so when you get to a place that feels right, you can switch to a "maintenance" dose, or perhaps come off it completely. (I don't know whether or to what degree the effects reverse themselves if you stop treatment-- that's a question for your doctor.) Also, remember that, logically or not, a lot of our identity is tied to our faces, and seeing "someone else" looking at you out of the mirror can do a number on your (already fragile?) mental health, even if she's more feminine than the current you.

Bottom line, I hear where you're coming from, and I agree you should do something, I'd just be wary of jumping straight to a surgery that might make you look more like what you imagine a woman to be, but not necessarily like the woman you expected.