Have you ever lied?
Have you ever stolen anything?
Have you ever lusted after another person?
Have you ever coveted something owned by another person?
Have you ever used Gods name in vain?
Being a good person doesn't require that one never have done any of these things, but only that, if one has done some of these things, one understands that what one did was wrong, and regrets having done them, and has decided not to do them anymore.
Also, merely lusting for another person is not a sin, or even morally problematic-- at least, not as far as Judaism is concerned.
And we consider that it would be impossible at this point to use God's name in vain, because that commandment refers specifically to the four-letter name of God which no one knows how to pronounce. FWIW, it also refers specifically to using that name as witness in false oaths or blasphemous curses (not like cussing, but like literally directing a formal curse at God Himself).
I might also say that more important to being a good person is caring for the poor, trying to make society more just and fair for everyone, helping the helpless and the vulnerable, feeding the hungry, and housing the homeless.