First of all, OP recognized that there were some issues with their attitude and was asking how to adjust it.
Second, having one II is very different from one acceptance...it is not a guarantee, there is still a very real chance of OP not succeeding this cycle. That may change as more IIs come in or an acceptance finally does, but it's not ridiculous to not be all 'I am a lucky butterfly because I have this II' because an II by itself is not success.
Third, OP is upset at not having any IS advantage at their IS school. That's not an uncommon complaint of CA students, not by a long shot. The fact that their IS happens to be UCSF is part of the problem. They didn't pick it because of the notoriety, they picked it as an example because they live there.
Finally, most of those expensive east coast schools, while difficult to get into, have great financial aid and are actually better for a low-income student to go to than even a public IS school. When I chose my undergrad, it was BY FAR more financially responsible to go to the LAC in NE with a $55k+ annual tuition than it was for me to stay where I was, live with my parents for free room and board, and go to the public IS school with both need-based and a large merit-based scholarship. Wasn't even a close contest. And yeah, SF is desirable to many people (for what reason I cannot fathom, after living here 2yrs, but that's beside the point)...but that also makes it a very expensive place to live. None of the things you cited in any way proves that OP is particularly well off or advantaged. Making a list of random nice things OP has going for them is meaningless and no, doesn't prove that they're more entitled than the usual. I'm sure there are many people in the world who would kill for the advantages you've had in life, yet you're whining about an internet forum post. Does that make you insanely entitled?