I just opened lightroom and its as if i jus opened for the first time. I only have 1100 photos and theres thousands missing
Could it be possible that you landed in a different catalog?
Go to file menu> Open recent> look for another catalog in that list.
Or, you might need to look for the main catalog located on your system.
lost photos with an exclamation mark cant be found How can I find them in LR 5