My IQ scores throughout school seemed to decline from about 130 to 115(stanford binet) by graduation...I am fairly certain my actual IQ is higher, based on how fast I think, learn, and perceive things, but need it measured to get a girlfriend and meet people at Mensa .
A couple thoughts:
Mensa is heavily skewed toward men so maybe a good way for a woman to meet a boyfriend, but maybe not as good of a way for men to meet girlfriends (not impossible, certainly, but your odds aren't as good if this is your purpose in joining as it would be were you female).
Like the pp, I'd suggest just taking the Mensa admission test. Should you not qualify, you can always submit other evidence if you have or get it.
Regarding your statement that you took the SB repeatedly throughout school, if you have the results from those earlier 130 test scores, you can also submit those if they are on school letterhead or signed by a licensed psych with his/her license #. I believe that you only need to have one score at that point even if it is quite old. For that reason, I'm pretty sure that more than 2% of the population would qualify for Mensa.