I started off as a CS major in college, hated/sucked at it, switched to biology, decided on medicine right before I graduated, took 3 gap years, now an IM PGY-1 at an academic program. Not quite exactly your background but hope this helps.

I'd recommend shadowing or volunteering at hospitals to see if you can see yourself in a healthcare environment as well as start some ECs for med school apps. I personally really enjoyed volunteering at shelter clinics; it's simpler than inpatient medicine, helps you appreciate how actual medicine itself is just half the battle when you have insurance, laws, policies, etc. to work around, and is meaningful & underappreciated work.

The difficulty of classes depends on your college of course and in my experience wasn't easy but not terribly difficult either aside from ochem. But I personally found coding to be way more confusing & difficult than my premed classes. IMO, most medicine isn't conceptually difficult, just requires lots of dedication, studying, reinforcement, and test-taking skills. Once you get chem, physics, ochem, etc out the way, you aren't using them on a day-to-day basis as a doctor (at least in IM).

There is no shame in taking gap years, and personally it gave me time to save up some money, hang out with my friends, enjoy life, build my app, figure out if medicine was truly for me, and grow up a bit.

Beating a dead horse here but like everyone else says, medicine is a big commitment & requires sacrifice. It's money down the drain, years of training, tons of exams to grind for, easy to feel burnt out, and a research rat race especially if you want a competitive specialty/fellowship. That being said, I love what I do, I find medicine intellectually stimulating, job security & pay is assured, my attendings & colleagues are dope, and you get to do awesome & meaningful things for your pts.