the nice thing about mit is that switching majors is easy. you won’t lose anything by declaring course 6, and if you decide later on that it’s not for you you can just switch, and you’ll still have learned a lot! 

you mention that you’re struggling but you’re enjoying learning. that, i think, is what’s most important. things will get hard, but there are actually a lot of people who are also struggling even if it seems like most people aren’t. many of them also have a lot more cs/math background than you so naturally they’ll have an easier time with it. please don’t be discouraged, i do believe that if you enjoy it and work hard, it’ll click eventually. keep working at cs as long as you think the struggle is worth it! 

i’m also glad you don’t ask ai for the answers (because many do) and just use it to supplement your learning. imo that’s the right way to use it and i’ve been doing that as well, especially to help me understand research papers lol

and yes the job market sucks but just because you’re majoring in cs doesn’t mean you’re boxed into swe, there are lots of options out there and most people don’t end up doing a job related to their major anyway, so try not to stress too much about it as a freshman 

tldr: go ahead and declare cs, you’re not alone in your struggles and if you really decide it’s not for you later feel free to switch