16yo here. I've been getting with this girl for about a month. Every time we met she would give me a blowjob. The last couple times she told me she wasn't in the mood for it, even after I fingered her for 20 minutes. I've been pleasuring her without her even touching my dick. I'm not trying to force her but I want her to give me head. Am I being selfish? If not, how do I get her to suck my dick?