I get nervous walking by myself too, I started taking my dog with me, my cell phone, and I carry a pocket knife. I also remind myself I don't live in a high crime area and I go over crime statiscs in my mind to help ease my fear (I use to study criminal justice before swtiching majors)

Take small steps at a time Google, it's okay to break this down and work on getting more and more comfterable a step at a time. Like go to the library one day a week by yourself, then take it up to two days a week and so on till you feel more comfterable

Best Wishes
Typo