Can I sign up for the navy again if i back out of my contract now?

i have a contract right now (i am in DEP, i leave in a little over 3 months for basic) and am having second thoughts just like everybody does. if i decided i do not want to go anymore is there any chance of being able to join again? if so what is the minimum time i would have to wait? and also i barely made it down to the required weight to join and they are telling me i could be kicked out if i don't get my weight down again, so if i used that as my ticket out would it be any difference in being able to rejoin if i did that instead of just backing out?