Hi Tandy, since that is your first post expect a mod to be by shortly for the introductory routine.

First, i have very little experience (I'm new to all of this too), but I'm going to echo the sage advice I've heard repeatedly since joining these forums: Passing isn't everything. What's important is that you are true to yourself and happy in your own skin.
Second, if passing is something you do feel you need, don't give up hope yet. Extra weight can really hide your physical features, and you may find that as you lose more pounds that you will see potential you didn't know you had. That is what happened to me at least, and a big part of why I am on these boards today. And the height issue is just one of many factors in final presentation, so that doesn't disqualify you inherently from passing at all. There are many women who are your height or taller. I was terrified about my shoulders, but the more I read and the more I look up dealing with them, I've found not only numerous indications they don't matter, but that there are actually tons of beautiful, famous cis-women with the same shoulders!
Lastly, what you can expect from these forums is simple. Love and support!
(Oh! And congrats on the weight loss, that is always a huge accomplishment! I have about 40 pounds more to go myself for my current goal.)