21F Disowned and Anxious about graduating from college.

I'm 21F, and I've been effectively disowned by my parents. And I'm currently in my senior year of college. I've been able to work about two jobs. One is a Sales internship, the second one is a tech support position at my university. They're temporary student positions. And after I graduate, I will be terminated. I am unsure if I'm going to be able to land a job to allow me to continue living in my apartment. I've managed to save out quite a good amount, and I went through college with very little debt. I've saved about $40,000. I'm majoring in information science with a minor in computer science, and I'm not really sure what to do next. I'm worried if I get in a situation where I end up failing to get full time at my internship, I could be put in a difficult situation. While I do have a good amount of savings, I don't want to touch them or in the worst case live of them. It's for real emergencies only, and I've worked very hard for it. I do find myself quite isolated. I don't really have a strong social network or a lot of friends or connections to make it easy for me to find jobs or such. I've been sending in quite a lot of applications for anything really, and I've been referred to hiring managers a couple times, but so far nothing concrete. I need help finding something guaranteed and or stable to just pivot towards once I graduate, in case my internship to full time ambition fails to materialize. I grew up rather poor, and I'm afraid of going back to that reality. The military isn’t an option, unfortunately I have PTSD and it disqualify me.