21st Birthday Speech

This is the first time i´ve ever had to do something like this although time is on my side i´m still worried about completely screwing up my speech for my 21st birthday. So i was wondering if anyone had any ideas on what i should include in my speech, jokes...etc... I´ve thought about opening with a quote but is this too corny?

Im looking for a speech for my 21st, im extremely nevous as ive never done this before, im so clueless about where to start & what to say

Just remember you now have the key to do what you want when you want and for as often as you want and that's now official