Warning English is my second language and I am too tired to check my grammar.

I read a study about a gene that If removed lets older rats get over a fear that was implanted by humans researchers. they made them fear a sound I think don't remember the study too good because I read it a few days ago and if the rats didn't overcome the fear in a given time they will remain with it the rest of their life. This study made me more anxious because I think now that even therapy won't help me because when an fear is cemented in your brain you can't get it out. is it true?

And if you can get over a fear with therapy. Can you cure anxiety? not anxiety like if somebody wants to kill you but anxiety that has nothing to do with surviving. Can I return to live a normal live? is my question because I feel I can't and is making me feel like life isn't worth it anymore.