Hmm, how do i find the address i sent bitcoins to?

Thank you i did and find ewerything you told me.

Helo, need help.
Its my first time. i buy bitcoin , downloaded Bitcoin Armory, deposit bitcoins.
Now i have no bitcoin in my walet, my wallet is offline, it did not make that synchroni zation.
I find out that i need to install Bitcoin core, but i dont want to, its to big for my pc.
How do i get back my bitcoins,thx.