I get less confident of snowboarding park as the day progresses?

every time i head up to snowboard i do great the first few runs (better then usual) but as the day progresses i get more scared of hitting jibs and jumps and going down steeper hills and i've noticed most people need to get warmed up and they get better and better the later it gets but not me i don't need to get warmed up i just do great right when i hop on my board but then when everyone else is doing bigger jumps i'm not