I am not a teacher, just someone who also sings. I believe that these songs were too close to your speaking range. We tend try to sing like we speak when something is in the same range as our speaking voice.
Occasionally when singing higher you started to get a good vibrato going.
There are a lot of videos on youtube about support.
Think back to the last last time you were frustrated about something, maybe you were late for work, stopped at a red light, the light turns green and the car in front of you does not move. You may say something like "WOULD YOU GO ALREADY, YOU $%^%##. I'M LATE!!!!!! Guess what you used support. Especially if you said it at speaking volume or slightly above.
That is the kind of intensity we use in singing.