frats

The quick answer is "no", but it really depends on the fraternity. Some are straight up stuck-up douches that will completely exile you for the rest of your SDSU experience. While others are more chill and will let you in now and then depending on who you know and still there are those fraternities made up of pure losers that need to pack their parties with whoever than can.
doesn't take much to figure out which frats fall in each category.

but more importantly, the bottom line is:
don't rush if you're not going to pledge you damn geed.