My parents too had a hard time swallowing my grades in freshman year (Math 53 and Stat 134 pretty much murdered me). My advice is just give it time. My dad was pretty critical of me until he found out from his friends who also have children going to Cal also went through their own academic struggles.
With regards to the social and relationship aspect, it too, will take time. First semester of freshmen year usually is amazing, or sucks a lot. Second semester WILL get better. You will meet new people, be presented with new opportunities via clubs or other social activities, and will feel more at home on campus. I’m glad to hear you have someone really close to whom you can talk to; it took me a while to find someone like that.
As a current sophomore finally getting down good study habits, my advice is just to find an activity you enjoy besides studying, because there are diminishing marginal returns when you hit a certain number of hours of studying. Trust me; as someone who has camped out in Moffitt and Main Stacks, it doesn’t help. Having a outlet to breathe and relax after breathing in the stale air of Kresge or freezing in the lower levels of Doe really does make life so much more bearable.
If ever want to talk, feel free to PM me! Best of luck, and enjoy your break.