at 25 i was teaching and getting married.
at 25 the world is still fairly open, your not to old to retrain and generally you've not got that high up the pay tree to take to much of a loss to start in a new profession.
depends on how serious you are and what you want to do, you might have to make some sacrafices to start in the job you actually want, and work your way up to a point where your at now. this could mean saying good by to the zed and saving cash else where to get started.
what do you want to do
police is a good career, the armed services still have till your 27 to join.