When I started fieldwork, I didn't expect to end up emotionally exhausted

Very early this morning (between 5-6 am), I made my way to a school for fieldwork. I left Cambridge really early in the morning for first period lessons, as I rely on public transport and my whole journey to school on public transport would take about one hour, minus the time taken for me to cycle to the train station and walk to school, and I’d rather be early than late.