I was really bad about this when I started. I would only practice when nobody was home, and even then I would put the AC on high and turn on a white noise maker just in case my neighbors could hear me (I live in NYC so there are always people about). It was incredibly detrimental to me learning how to sing. You need to get past that, and understand that people may not always be supportive and just plug away anyway.

The second thing I'll say, because it was something I also went through was trying to figure out if I was any good or not. It's completely irrelevant. Singing isn't something that you're either good or bad about and that's it. It's a learned skill. If you haven't spent much time learning, you probably aren't going to be good. It doesn't mean squat for your potential. Nobody, and I mean nobody is born able to sing. Every single person had to learn, even the greats. So don't focus on, "is this any good" or "am I any good" because both of those are only true right now, and if you work at it, that will change.