I believe that love doesn't exist

I learned this from a young age. my dad didn't want nothing to do with his kids. to busy chasing women and lied to us all the time. my mom was there for us kinda but she was busy trying to please her 2nd husband. which he user to straighten his life out. I am 40 years old now dated in late teens and early 20s. I only had sex with 3 women in my life. I didn't have sex for 15+ years. I don't trust anyone and believe everyone's a piece of shit. I have been with my wife for 4 years now married for 2 and have an 18 month old son together. I love her so much she is a great woman the most beautiful woman I have seen but I feel like she doesn't love no more. this is my problem. some she gets short real easy for no reason and the way she kisses me. we have sex maybe once every 2 weeks and it seems forced on her part.no intimacy she will not let me touch her go down on her nothing . just shower sex and doggystyle only. I have never wrong her or cheat on her nothing. I'm not perfect. I'm a little bit lazy and fat. do you think that she doesn't love me no more? I really what a women's advice on this