Why is Telemachus fearful when his father first reveals his identify?

Telemachus is fearful when Odysseus first reveals his identity because he struggles to reconcile the mythical stories he has heard about his father's adventures with the reality of the man standing before him. Overwhelmed by emotions and the fear of the unknown, he worries about the dangers that may come with Odysseus's return and the implications it holds for their family's safety. This moment also highlights Telemachus's feelings of inadequacy and uncertainty regarding his own role in the unfolding events.