Hey there!
Don't worry, that sensation is pretty normal. Although, in most cases, its not really a loss of libido. In my experience, it only seems as though you've lost it. The only libido you knew was the action-pumped, full throttle, bang-anything-that-moves testosterone vibe. The one you're given by female HRT is much more subtle, waiting to be tempted out of its cave. If you're not prepared for it, it can be quite a shock to the system, and it makes a lot of sense that one would experience it as a loss of libido. If you're referring to Mr Snake's performance down there however, nothing you can do. Some of us lose that, some of us can't get rid of it.
Of course, if you don't like the experience, by all means take some time to think it through and consider your decision. It's a pretty normal thing and I wouldn't personally be worried (2 years down the line for me). In my case, it was a welcome change, as I found it more rewarding this way round. It must be said though that your preference doesn't in any way make your gender more or less valid. You should move forward based on what you want from it.
In case you aren't aware, in many cases the body rebels after a long period of time and becomes less responsive to E and Prog, and starts responding more readily to the low levels of T in your blood and you may find some of the male libido returning. Don't bank on that, but it may be something to consider. That's why your doc should test your hormone levels every few months, precisely because the scales constantly shift.
Side note: it is a possibility you truly are losing any and all libido. Given the context, that wouldn't be on the top of my list of causes but if you really are worried, perhaps talk to your doc/psych about it. It may be very worth doing some introspection surrounding your sexuality and orientation. If you're still unhappy, consider your reasons for transitioning hormonally. Worst case scenario, you just labelled yourself incorrectly and you still have plenty of time to backtrack. Although, if you've made it this far, it is very very unlikely that you were doing it for the wrong reasons unless you've absolutely hated E. Just a question we all have to ask ourselves at the stage you are currently at

You'll probably know for sure at around the 3-4 month mark.
Much love
xx