there is nothing wrong with working subway...

before i was full time software, i did just about everything i could...
1. mowing lawns (constant from 8..18 )
2. shoveling driveways (12..18 )
3. worked a farm (2 years, 13..14)
4. bus boy / dishwasher / stock boy / short order cook (4 different jobs, 14..16)
5. sold assorted goodies for my high school class (13..17 .. good for salesmanship and gets exposure talking to customers)
6. fast food.. burger king, deli (15..17)
7. parts runner for an auto shop (17..18 )
8. gas station attendant (17..23, multiple stations)
9. construction (19, concrete forms.. sucked hard)

at 19 i worked for bowmar ali (def. contractor)
at 19 i worked for Wang labs (goes to show how old i am.. and yes... i do fart dust)
at 20 i worked for an MIT think tank/def. contractor outside of boston for 4 years

then it was real work. in all of those jobs, i made squat (<$8/hr) until i was 23.. when i decided i knew more then the others and pushed for a raise to $15/hr or i was walking (really, i was pissed they made me cancel my 3-day weekend trip with my girl at the last minute.. and i was brought to dc to run the office of 10 people... all of which made 3 or 4 times what i made)

the point being, set a goal for yourself... disregard the temporary jobs along the way... and you will succeed in getting where you want to be, so long as you continue to take positive steps in the direction you want to be. avoid anything that could be considered a negative step, and it'll all work out in the end.