"我很好，但不是天使。我犯过罪，但我不是魔鬼。我只是一个在大世界里的小女孩，试图找到可以爱的对象。"

Simplified Meaning:

The speaker is saying that they see themselves as a regular person who has both good and bad qualities. They are not perfect, like an angel, but they also are not entirely bad, like a devil. They see themselves as someone who makes mistakes but is generally trying to be good. For example, imagine a student who tries to do their best at school and be a good friend, but sometimes they might forget to do their homework or say something hurtful without meaning to. Despite these mistakes, the student is still a good person overall. The speaker also talks about feeling small in a big world and wanting to find someone to love, which shows their desire for connection and belonging. This can relate to anyone who feels overwhelmed by life's challenges but still hopes to find meaningful relationships. They are encouraging others to accept their own imperfections and keep searching for love and companionship.