Not Pregnancy Related. Advice please!

Ok. So I am 19 (will be 20 in less than a week) but me & my ex have just broke up after almost 5 years. We have a 1 & half year old & one on the way. We currently still live together because our lease isn't up til March. I am trying to keep in that I am so broken & hurt but It's beginning to get hard. Lately I have been thinking that I would love to just start over/ get a fresh start. My dad lives in Florida & I am thinking about going there but there is a few problems with that.... 1st one is obviously the custody stuff (idk if he'd try to go to court or not but I would more than happily arrange stuff for our children). 2nd is my job! I work at Chrysler (the factory not dealership) & it's a great job and 3 days a week gets the bills paid plus extra money (without government assistance). My grandpa got me that job & I don't want to just throw that away you know... 3rd is that I don't want to leave the rest of my family especially my mom & grandpa. At this point I don't know what to do because I don't want to be selfish but I feel like it's something I need. I have also thought about when I I go on maternity leave that I will probably fall on my ass and won't be able to keep up with everything even with stuff saved up being that not only do I have to provide for my son & I but get everything this baby will need.