I Want to become a secret service agent, but im not sure what path i have to pursue?

im 26 years old, born in the United States but i was raised in Mexico, im an attorney, and from what i understand i have what you call a bachelors degree, i also want to become a lawyer in the United States but the secret service is my dream job, i was thinking of joining the national guard to become a Military police officer to get training and experience in order to get into the secret service. Another reason for joining the national guard is because i need money, im in a very bad money situation and i have to support my parents. Am i too old to join the army? what if im not picked by the secret service? at the end would be waste of time. so what career path do you think i have to pursue in order to become a secret service agent and continue with my career as a lawyer, that way if i dont make it to secret service i can continue with my first career as an attorney, should i keep studying to become an attorney in the united states and after that give it a try in the secret service? do you think joining the police reserve would be useful?. Im getting old and im stuck in this hole, PLEAAAAAASEEEEE HELP ME !!