How do I delete my instagram? Please read!!!?

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I made instagram on my iPhone3G a long time ago. I didn't know how to make it private so now everyone can see my photos. I thought it would automatically be private. So I was putting old ugly pics of myself editing them thinking no one would see them, but my friend was like, oh I didn't know you have instagram. And was going through my pics!

The problem is they've stopped doing updates for the old iPhone now, so it won't let me get onto instagram!?! So is it stuck there forever? Or would it work if I used someone elses iPhone and logged into my instagram there? If so, how do I delete this? ASAP don't even think I can remember my password please help..