Is one finger supposed to fit in the subacromial space?

Hello everyone!

I don't know if this is the right place to aks this question but it is bothering me so long. Is one finger supposed to fit in the subacromial space (between the acromion and humerus in front of the shoulder at rest)? I cannot fit a finger in that space, not even close. How is it in your shoulder?

If you can fit a finger between that space you have an unstable shoulder. You are normal so no need to worry.