Pregnant again n need some advice please?

Im 23 and im pregnant again with my third child I have a 4 n 2 year old I also been with my bf for eight years im happy n so is he the only problem is how do we tell our family's we live on our own since our first child we never ask for help from either family besides babysitting for four hours every other day well we work I feel like I let my family down I also know both sides r going to say we r stupid n to abort it cause we r young n so on I was the first one in my family to graduate n go to college n I do everything on my own so I just need some advice to tell them n let them know that im expecting again with out feeling down r scared