It is perfectly acceptable to express your desire for more work to your boss. It shows initiative and a willingness to take on responsibility. However, it is important to approach the conversation in a professional and respectful manner. Be clear about your strengths and how you can contribute to the team. It is also important to acknowledge the contributions of your colleagues and not put them down in any way. By presenting yourself as a team player and someone who is eager to help the company succeed, you will set yourself apart from those who are not as proactive.