no/bad ECs because of family circumstances

Hi! I'm a Sophomore at a T100 in-state school currently for Mechanical Engineering looking to Junior transfer to preferably an LAC (but I'm open to any other options with good aid). I'm looking for a more interdisciplinary curriculum (mathematics major most likely) as opposed to the more strict requirements my current school has that restricts me from taking more credits in humanities.

- College GPA is a 3.81 currently but high school GPA is bad (like 3.9W 3.4UW). SAT 700R 780M.
- Can most likely get a good rec from humanities professor (and can intertwine it in my narrative). Not sure about a second professor.

- I believe (??) my family is considered low-income now, wasn't low-income in high school though. Definitely seeking aid.

- I did get a C+ in calc 2 my very first semester 😭 not sure how that will impact applying to a math major if GPA is more important according to this sub. I also audited a class (not withdraw) fall sophomore semester, but it's not for my current major.

My main issue is that I have no significant ECs, just 2 clubs and a part-time job on the side because since my first semester I've had home issues (DM, I don't want to air out all my personal circumstances in a reddit post). While I want to limit these circumstances to the additional information section, I am open to integrating them in my writing supplements if it were to help my chances.

TLDR; how to approach explaining no ECs because of serious limiting family circumstances. any other advice would be appreciated. thank you!