Not enough sex in relationship
Me 22M and my GF 23F met at Uni and have been seeing each other for just over 4 months and currently live together. At the start of the relationship everything was great with our sex life, we had regular sex about 5 times a week. Which is exactly the frequency I was looking for, when we were just talking she gave off the vibe that she wanted to have regular sex and that she liked having sex.
Now 4 months in and we only have sex about once every 3 weeks, it doesnt feel enough for me and makes me feel undesired and creates some sexual frustration and resentment, I dont want to resent her because I love her. What makes this so hard is that the relationship is exception everywhere else its exactly what I want it feels like a healthy partnership but I can't help but feel frustrated we arent having enough sex.
I have brought this up with her and she said its because she's been stressed. For context she started a new job 3 weeks ago her first job after university, I use sex as an escape from stress and a stress release mechanism but she shuts down completely and it makes me feel a bit disconnected.
When I bring it up I fear it will make her feel obligated to have sex with me but what I want is for her to want to have sex with me, I try to initiate about once or twice a day and it gets shut down immediately and that rejection doesnt exactly help me feel wanted or desired.
She also has mentioned a couple times that she feels a little self conscious because I'm more attractive than her and she feels like I am out of her league. I dont agree but could this be affecting her sex drive?
Im open to any advice or questions.
EDIT: I clean the house everyday (dust, hoover, wipe down the kirchen, clean the bathrooms and make the bed) to make sure its spotless for when she comes home from work, I make breakfast for us and cook dinner every weekday and frequently give her full body massages. I take her on suprise dates every week and try my best to take what i can off her plate.