Hi there,
I have never taken Lexapro myself so I cant help with that side of things but there are plenty of people on HW that have tried (Or are taking Lexapro) who can help)
As for admitting defeat... If you admit defeat it means you are in a competition with something. Try thinking of your mental health as a river which flows. Occasionally, you will find rocks and other obsticles in your path but (As water always does) you will get round them and carry on flowing. Depression isnt the end of your river, simply a rock for you to go round.
I hope that makes sense (If it doesnt, let me know!)
Darren