What should i choose?

Ok so heres my problem.. Last october i signed up for the navy. Was put in the DEP program. During that time, i got really scared. Now im supposed to ship for basic on August 15th, But i cant make myself want to do it. My sister threw her life away and is working 2 jobs and supporting a dead beat husband. My mom keeps saying please dont turn out like your sister. I just did an application for a job and im pretty sure ima get it. But i dont know if i want to leave and lose my husband and not see him for months at a time and make my family happy, or do what makesme happy. I just wanna be with him. I plan on getting a job, moving out cuz he has a job too, and in may we are moving in together. Hes still in school. I am going to save up my money and apply to college at the local college or get my fire fighting or cop degree. But it comes down to hurting my family and letting them down, or being miserable myself... :( What would you choose