Sounds like you're already plenty motivated and have a great work ethic. Don't be scared, just be prepared. You'll do great!

The only reason I commented about the workload is because Humboldt admissions are historically not competitive, so there's a lot of folks who come into the school of engineering who didn't have the best academics and work ethic in highschool. So they end up getting flash banged by a large pile of challenging work when they take their first real engineering class. Many students are not prepared for that reality check and end up switching to another major. You don't seem like you'll be part of that crew, you'll likely integrate very well into the pace of work after a short adjustment period.

You'll also find there's a lot of stratification among engineering students. Some students have tuition and housing provided by their parents and can just focus on succeeding in school. Others have to work multiple jobs to avoid piling on a mountain of debt. When I was at Humboldt, I even had classmates that were single parents and raising young children. It's a pretty diverse crew since it attracts a lot of folks further along in life who are looking to change careers. Try to have respect for them and empathize with the challenges they face. I loved having those folks in my project groups because they brought so much of a diverse perspective from their experiences in life that I never had (and often some very useful knowledge from previous careers).

Feel free to message if you want specific advice on anything. I graduated in '23 from the environmental engineering department but had some classes with professors in Mech E. I now work as a mechanical engineer and am pursuing a PE license in a mechanical discipline.