Quick question

Does anyone else find this rude or just me? Everytime me and my boyfriend do something sexual like wanking him off or sucking him off, he doesnt let me finish him off?.... He always goes urgh let me finish the job? Im there trying my hardest as hes my first sexual partner and i obvs need practice but he doesnt let me finish him off?.... He says im good but if im good why wont he let me finish it for him? I kinda find it rude? Does anyone else?🤔🤔🤔