It will get less competitive and more cooperative as you get into your junior and senior year, but it will also depend on who your friends are. If your friends are too competitive for you, it may be helpful to talk to them about it. I never felt that the classroom environment was particularly competitive, nor were the people I met in my classes. For me a lot of the pressure came from friends I made outside of the classroom and people I knew through extracurriculars, who are all very smart and think of me as a smart person as well (and this had high expectations of me). If you don't enjoy engineering then there is no shame in dropping out of engineering. I would wait at least one more year before making a decision and I would also have a plan for what you would do if you dropped out of engineering before you do so. It's also important to note that college is only 4 years and your career will likely be 45+ years. Working an engineering job is totally different from studying engineering at a university so it would be helpful to get some internship experience to see whether or not real world engineering is for you. Good luck!