You may pass with HRT or you may not. It doesn’t hurt to have a plan to make yourself as comfortable in your own body as you can be. If that includes FFS then so be it, there is no shame in making a plan to get it. And who knows, while you wait for surgery you may even begin to pass as time goes on. My face has looked completely different every year that I’ve been on HRT.
There’s also no shame in identifying as whatever makes you feel the most comfortable and the most safe. It is completely understandable. Lord knows we all wish we could be so confident in ourselves no matter what, but we have to do what we can to survive.
I still boy mode outside of work and friends because I don’t feel safe being seen as trans by strangers and it hurts less when I am misgendered because at least I’m not trying.
My advice for now, try not to fixate on what about your face is causing you to not pass. In most cases it’s not any one part but how things fit together and in any case the FFS surgeon will know best. Also, please try your best not to let “not passing” stop you from living your life.
Start as soon as you possibly can to start neutralizing the effects of testosterone as soon as possible and to have your bones grow in a feminine manner before they fuse such as your hips.
There is some debate on starting with lower dosages or not and how that can affect transition. Every body is different. You will need to take a form of estrogen, this typically comes in tablets, patches, injections and gels.
You will also need something to block your body from producing or absorbing testosterone. There are a few types of drugs you can take for this. The most prescribed one in the US is spirinolactone. Some boards recommend waiting to start spiro and starting at a lower dose as there has been reports of it causing breast buds to fuse too early.
A medicine that you can start right away without having to wait and you can get from any doctor is finasteride. It can help restore your hairline and stunt any masculinizing effects you receive from DHT, a byproduct of testosterone. Once your testosterone is fully suppressed you can stop taking it as there won’t be any testosterone to convert into DHT.
Here is some light reading to help understand the process.
https://diyhrt.wiki/transfem
https://diyhrt.market/transfem-hrt-guide
https://transfemscience.org/
https://transcare.ucsf.edu/guidelines/feminizing-hormone-therapy