It’s college, everyone procrastinates. You’ve got an edge because you know it’s your weakness, which gives you a chance to fix it. Premed life is hard at UCSD, but it’s honestly going to be hard everywhere. If you commit to not procrastinating, even if it’s just for your first quarter, you might be able to handle anything all of these schools throw at you. Just a thought
Parties: UCSB > CPSLO > UCSD. That’s not to say they don’t exist at UCSD, but you’ll have to look harder for them/try to meet more people early on or join Greek life (since there’s no central frat row for parties/student ghetto like there is with Isla Vista). Tbh if you’re a social guy you’ll be okay
SLO is the liveliest college town of the three, La Jolla and Goleta are equally pretty, and San Diego is the only real city (more stuff to do on weekends)
If you’re certain you want to be a doctor, UCSD is the only school of these three with a hospital on campus (it has four within walking distance), which means volunteering, shadowing, clinical experience and research opportunities. It also has the most undergrad research opportunities in the area, the only med school, the only pharmacy school, and the highest ranked bio department. You’re still going to have to keep that GPA up, though.