Is it normal to want to fuck your mom ?

Ever since I was a teen I would fantasise about my mom. She is a plump woman with big boobs and a bug bum. I regularly smell her dirty underwear and also try to spy on her when she is changing or sleeping. Sometimes I wait for her to bend over for something, get behind her and I get my nose just a few centre-metres from her ass and sniff. I even listen to her getting fucked by my dad at night. All of this turns me on really badly and I want to fuck her. Is this normal?