Is this normal?

I’m 29 years old after my son was born last year iv lost interest in having intercourse with my wife. I mean we still do it but i can only last for like a minute or 3 minutes now a days. I work a lot and do music and workout to maintain my current job position. After i climax i just want to sleep or be left alone. I feel terrible that i can’t satisfy her the way i should. Am i the only one going through this?