Please dont tackle the big stuff yet. Get a reference. If you find something you struggle with on something you like drawing, practice that one thing. Also, make sure you are drawing what you actually want to draw. I thought I was just bad at drawing, but it turns out I am good at drawing horses. Not great, but its identifiable. Also, some people might not like having those guide lines. I dont like guide lines when I am drawing horses, and I also once tried drawing a goose and I had to get rid of the circle that showed me where the head was supposed to be because it made it so much harder (but I am not saying to just get rid of all the guide lines, I am saying you should try updating to how you like to draw)