Depends on the fear
Well, i wouldn't say "weird".
.. I don't even know you. But there are reality-based reasons to fear public transport (muggers & pickpockets in some places), exaggerated fears (getting lost, catching the flu
), and delusional fears (dangerous space aliens). Or there may be fear without a focus at all. Maybe talk it over with a therapist
if this fear hurts your travel
ability or comfort.