I want to know if my chances of going into UCI for medical grad school is lowered if I attend CSULB, rather than attending a community college than transferring into a UC. Because I heard that if I do go to a CSU, then it’s virtually impossible to get an admission into a UC for med school, but then I asked my teacher what I should do, and he told me that I should attend CSULB my 1st 2 years of college then transfer to a UC. So, I searched up that, and people’s been saying that’s impossible too because you’re already in a system. So what should I do? College is frustrating me right now 
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I think you’re confusing getting an undergraduate degree and a graduate degree. I’m guessing that what you’ve been reading is that if you attend a community college (versus a 4 year college), it’s easier to transfer to UCI to earn your Bachelor’s degree. That is true.
But if you attend CSULB and earn your Bachelor’s degree, you will certainly be considered for UCI’s graduate school program if you apply. And the fact that you attended CSULB won’t lower your chances of admission.