Composure during a fight

Had my first Muay Thai smoker about 2 months ago and had unfortunately lost to a decision. I’m proud of the fight I put up and looking back at the videos, I definitely put my fair share of effort and did my damage in the ring as my coach has said. However, during the actual fight, I felt very reactionary and it was much harder to pick my shots as I usually do in sparring. I feel that if I had the same measure of composure as I do during sparring, I could’ve landed much better and more often, since looking back at the video, I see shots I would’ve landed any day. How do you guys remain calm and composed during your bouts? Is it just something you come to obtain with more experience in the ring?