Based on the information, it can be inferred that Annie is under 18 years of age because she does not have the intellectual maturity to understand an STI as a serious problem that she should report to her partner and seek help.
An STI is a sexually transmitted disease, which, as its name indicates, is only transmitted from one person to another through sexual contact.
Annie's attitude is serious because she is not going to tell her partner that she contracted a sexually transmitted disease, so she could infect him once they have sexual contact.
Additionally, she does not want to seek medical help which can be harmful to her health because sexually transmitted diseases can affect the functioning of the entire body, an example of this is HIV.
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