This will be one great day for you -- but alas, it might not be such a winner for one of the most important people in your life. Being sensitive to their moods but still able to celebrate yours is a delicate dance, but you can do it. Just make sure not to gloat too much around them. You should definitely not set aside your happiness because you're afraid it might make them feel bad, though -- they would not want you to do it. Besides, it's a very bad habit to start.