IWTL how to have a pleasant singing voice.

Right now my voice is very flat. If I make it low it starts cracking, and when I make it higher, it sounds whiny and weak. I can only manage these three pitches.

I just want to not be ashamed of singing to myself, not even considering singing in front of other people.

I am not tone deaf, my voice is just weird. Even when I speak my voice sounds weak and my pronunciations are off/weak. Hearing myself recorded makes me want to run away. I acknowledge that everyone finds their own voice weird but mine objectively sounds worse than other people.