Read what you want to read. Don’t be afraid to ask about erotic novels, mental health, LGBT books, etc. The public library is for everyone. If you really don’t want to ask me, or my co-workers you can look them up on our online catalog.
For this reason libraries all our the world celebrate “Banned Book Week” which is an annual awareness campaign that celebrates the freedom to read, draws attention to banned and challenged books, and highlights persecuted individuals. Its goal is “to teach the importance of our First Amendment rights and the power of literature, and to draw attention to the danger that exists when restraints are imposed on the availability of information in a free society” (See the ALA).
Libraries and librarians attempt to ensure the availability of those unorthodox or unpopular viewpoints to all who wish to read them. We strive to keep material publicly available so that people can develop their own conclusions and opinions. So don’t judge and don’t be ashamed. Read what you want.