The way I see it is you are getting five hours in without them being in the house, at the moment anyway. So do your heavy work then, the work you know you need to get at and improve on. Play things you do well when they are home. Instead of holding back, start thinking like you are performing for them, you may start to gain confidence towards performing.
But as mentioned, this is normal otherwise, most of us want other people to hear only our best music not us hacking away learning a new piece, for instance.
My wife's sister has come to live with us, I presume for the summer but who really knows how long. Anyway, different ears, I almost shut down practicing all together at first, in fact I closed up my grand piano and put my music away for a while, while they caught up on old news together in the living room ( that took weeks it seemed like).. Slowly I've worked my way back into it. But really I prefer she isn't in the house when I practice especially new music. You have to understand I've performed out and done recitals and still feel this way about practice sessions ! Consequently I've answered many posts around the forums about digital pianos simply because I've researched them a lot and played several thinking I'm going to need one so as to use the silent mode option in them. If she doesn't leave this will happen eventually ( plus truth be known sometimes I feel like practicing at 3 or 4 AM because I've had some revelation of some sort). Plus we have a tenant, though his apartment is pretty sound proof to our main house. I can play all day to my wife, in fact I play my best to her but even then I like to hack out music alone. I need a willing audience sometimes not unsuspecting one but on my terms.
So don't think you are alone. I'm 62 years old, started music when a child with the accordian, felt the same way then as I do now. When I'm ready to perform, then I want people to hear me not before. You will just have to work around the hours when they aren't home or occupied in a way that they probably aren't listening anyway. But really performing is a good thing for your musical self esteme in the long run, again on your terms !
Oh, I had to modify this, sorry it's so long. We now have the windows open as nice air is starting to filter back in after the summers humidity and having ac on in the house. Last night I was practicing for an hour or so and then came in to go on the computer. Someone down the street was really working out on a drum set !! Hurray ! And about two years ago there was a guy living up back here who practiced bag pipes. It was good that he practiced bag pipes because he needed the practice but when he got it together it sounded quite nice. He must have played for funerals or some such thing, always played Amazing Grace, never heard him play anything else.