Is it

 Elvis Presley 

Hello

 Hi

.....

 Musco Stella skeletal ortho gym 

I should

 Be at a gym 

To let you know

 If 

Then

 Well I didn't know how much pain I was really in

Of

 The gym 

Now had you told me

 I first would have wanted a tour 

I'm suspended from a gym

 That I didn't even know I was a member of 

My head aching

 From my eyes hurting 

My eyes have been

 So strained hurting