It's normal for kids to wet the bed but if you stopped wetting the bed when you turned 16 and then suddenly started wetting the bed once again as an adult something could be wrong with your bladder muscles and you should see a doctor about it.
A doctor can prescribe you some medication that you can take and the medicine will slow down production of your urine at night so you won't wet the bed.
Stress can also cause bed wetting in both children and adults so maybe it's because you're stressed out about something.