I get really nervous and I make stupid mistakes. Every single time I've had an interview and I'm asked to code I end up making stupid mistakes because I try to

I get really nervous and I make stupid mistakes. Every single time I've had an interview and I'm asked to code I end up making stupid mistakes because I try to answer too quickly or because I don't sit down to properly think about the problem. It's definitely something I need to work on. Thankfully I got an internship that let me do a small project to demo my skills, instead of hazing me. And after my internship they were so happy that they offered me a full time job.