When I first started playing the guitar again (a little over a year ago) I tried singing along with the song. What a mess, I couldn’t believe my voice couldn’t do it. NOT AT ALL. What I found that helped me is listening to songs people from the community play and sing. We are all non-professionals (I think), we haven’t had voice lessons. So we just sing. I found everyone I listened to, could keep a tone to the song they were playing. They might not be hitting those high notes or low notes that the original band does, but the community singers made the song sound great. Scroll through the ‘play with us’ and find a song you like, listen and sing along. Even if it’s a little under you breath your exercising those voice strings.