my fuc* buddy wants to get together with me soon, but lately ive just not been feeling like i want to have sex because of some personal matters i need to deal with first. its been very hectic in my life lately and i don't know her well enough where i can disclose that kind of information to her. it's not because of her, but i'm just concerned that if i turn her down harshly unintentionally, she might think that i'm not interested, or playing games which is not the case.. how do i turn her down in a nice way?