Kinda weird question?

im only 19 me and my gf have all the time a few times the condom bust. im nervous bout her gettin preg lik i cant even talk to her about kids NOTHING about kids, baby etc or i will get real nervous and get bad thoughts bout me havin kids i wld still b there but jus nt ready for some ne time soon. so what do you guys think get back to me plz