The fingers on the left hand are too thin, which may not be suitable for learning cello, but you can learn violin. It is best to learn violin with the little finger of the left hand reaching or exceeding the second joint of the ring finger.
However, I have to remind you that it is very difficult to get started with bowstring instruments, especially for people without any musical foundation.
So I'd better take a lesson to learn clarinet first. When you learn clarinet to a certain extent, you will have a musical foundation, and then you will learn cello.
It is very good for adults to learn musical instruments to play the theme part (slow lyric part). For Cai Hua, no matter how much effort is made, it will inevitably leave regrets.