Help me!😢I need tips or tricks about sucking dick

I've been with my bf for 3 years . We have sex alot . But we hardly go down on eachother. When I would go down on him I was scared because I had braces , plus tbh I didn't really know how.🙄 After I would ask what am I doing wrong and he would help me & I enjoyed it even more . Especially when I got my braces off . 🤗 The last time he was here I told me I wanted to suck his dick before we were gonna have sex . But he said no . So I went ahead and straight up asked him do I suck or do I not make you feel good ? And he just answer that I seem like I'm not into it , that I do it just because. He also said I do good but I do it smooth tbh idk what he meant . But I love his dick and I do want to show him that I want it . Ugh!!!... I just need tips or tricks 😖 I want him to love so much that he would keep asking me to suck his dick. Please help🙏