It's important that you're able to at least try to objectively distinguish between what is real and what is imagined with regard to lower libido. It's extremely easy to suppress your libido even without finasteride simply by worrying about your performance. That should be telling. I don't mean to suggest that what you're experiencing isn't real, just that you should be aware of just how easy it is to lower psychologically.
If you've convinced yourself that the drug you're taking is invariably going to adversely effect your sexual appetite or performance to any degree, it acts as an inverse "placebo effect" even if the Finasteride really isn't doing much at all to your libido. Consequently, as a result of your belief, your body follows in kind physiologically to match the thought patterns you've subconsciously set as instructions for your body to follow.
My dermatologist that prescribed my Propecia was clear on this point, even using real examples of how of her patients on finasteride, the few that reported sexual sides were adhering to internet fear-mongering by the 1% crowd that actually do most of the posting, and they under perform when they start reacting to the hype. When she told them it's likely in their head, they come back 2 weeks later saying she was right.
I encourage you to experiment with this, and let go of any apprehension or misconception you may have about Finasteride, at least temporarily, to see if it isn't all just in your head.