How do I tell a girl I'm interested in she interrupts me too much to yammer about herself WAY too much?

This is an example of our conversations... I'm NOT lying this is literally what happens. She's really hot and I'm attracted but this shit is getting on my nerves.

Me: So I'm thinking of buying a bicycle...

**She cuts me off**
RIGHT SO I HAD THIS BIKE WHEN I WAS LITTLE IT WAS SO CUTE AND LIKE THIS BOY THAT WAS ON MY STREET THAT I LIKED, KINDA LIKED, BUT LIKE NOT REALLY *LIKED* LIKE LIKE THAT HAD THE SAME ONE BUT BLUE AND IT WAS SO CUTE HOW MINE WAS PINK AND HIS WAS BLUE SO I'D ALWAYS TIME IT SO I WOULD RIDE DOWN OUR DRIVEWAY JUST AS I SAW HIM COMING OUT AND THEN LIKE WHEN I GOT MY FIRST CAR I GOT A REEEEEEAAAALLY EXPENSIVE COOL ASS MOUNTAIN BIKE THAT I USED TO GO RIDE DOWN A LOCAL HILL TRAIL THAT PEOPLE SAID WAS HARD BUT I USED TO DO IT LIKE NOTHING I'M A PRO ON MOUNTAIN BIKES, I BEAT ALL MY FRIENDS DOWN THAT HILL AND CAME IN 3RD IN A COLLEGE RACE BUT LIKE THE GIRLS WHO WON 1ST AND 2ND WERE TOTAL TRY HARD THAT WERE LIKELY ON SOME SORT OF SUPPLEMENT I WAS ALWAYS FASTER THAN EVERYONE IN SCHOOL AT LIKE EVERYTHING. WHAT TYPE OF BIKE DO YOU WANT?

Me: (Stunned) Um... Something in like the $300 dollar rang-...

**She cuts me off*
$300 DOLLAR BIKES aren't REAL BIKES MY OLD BIKE WAS LIKE A 2000 DOLLARS AND IT WAS LIKE A REAL ACTUAL PROFESSIONAL BIKE AND BLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLABLA BLA BLA BLA
How do I tell a girl I'm interested in she interrupts me too much to yammer about herself WAY too much?
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