The phrase "am needed" can be replaced with numerous synonyms, depending on the context of the sentence. For example, "required," "essential," and "indispensable" can all be used to convey a sense of necessity or importance. Alternatively, "requested," "summoned," and "called upon" can be used to indicate that someone is needed for a particular task or purpose. In a more formal or professional setting, "obligated" and "duty-bound" can be used to imply that someone has a responsibility to be present or fulfill a certain role. Overall, there are many words that can convey the idea of being needed, each with their own subtle implications and connotations.