Erin - I think many people are surprised that when they finally try popcorn there are no problems. I eat popcorn all the time. Huge, huge amounts at one sitting. I've never had a problem with popcorn. I buy the Costco size container - you know, the container that's as big as a Mack truck.
I would tell you to go get that popcorn right now. But I think it would be even more celebratory to wait until your birthday and make a big deal out of it! A popcorn themed party seems very appropriate.
If you have reservations, go with the hulless (I've never tried it). I don't do air poppers because I like a bit of olive oil flavoring my popcorn (type of oil shouldn't matter at all). And microwave popcorn just doesn't taste as good.
My friend just told me how she does her popcorn - in a frying pan. I can't tell you how much better that works. Who knew? Almost every single kernal pops.
And after you've found that you're perfectly good with popcorn it's time to move on to very fresh kettle corn. Salt and sugar - yum!
(So if you can't wait until July, go for it right this minute.)