I realized my neighbourhood isn't really a safe place.
この場合、次のような言い方ができますよ。
ーThere have been a lot of crimes and deaths at different houses/apartments around here, so I have come to realize my neighbourhood isn't really a safe place.
「近辺で事故物件が結構ある。うちの近所はそんなに治安が良くないことに気がついた」
I realized my neighbourhood isn't really a safe place. で「うちの近所はそんなに治安が良くないことに気がついた」と言えます。
ご参考まで!