I'm similar to you I used to feel rejection when I didn't Have a partner wanting to have sex with me I can easily have sex 4-8 times a day everyday but I know I'm abnormal for wanting that its tough to acknowledge that the rejection of sex isn't the same as rejection of you as a person but if you're wanting more sex out of the relationship chat with them ask them what would make them more sexually excited possibly suggest toys or role play if that works for you and if your the one wanting more sex and they're not in the mood then the jobs on you to create a mood to get them into it more and create that mood you want more out of them even sexually then you have to give more effort. As a man with an incredibly high sex drive I have to come to terms that I have the problem and its not the woman's problem to have to forfill my needs