I'm a 22y male, 67kg. Recently I had a mesh repair for my inguinal hernia. After 13 days of the operation, the wound gets swelled. Is that normal?

No. You should call and discuss this with your surgeon. This could be a benign problem, but could also be an infection at the surgical site.
Likely. There is usually some resolving hematoma and fluid around the surgical site and the mesh. Should stabilize discussion with surgeon and follow instructions.