"Am positive" is a commonly used phrase to express personal conviction or assurance. However, if you're looking for alternatives to spice up your vocabulary or avoid repetition, there are plenty of synonyms you can use. For instance, you can say "I am confident," "I am sure," "I am certain," or "I am convinced." If you want to convey a stronger sense of faith, you can say "I am steadfast," "I am unwavering," "I am resolute," or "I am determined." Alternatively, you can use optimistic terms such as "I am hopeful," "I am upbeat," "I am positive-minded," or "I am optimistic." Whatever word you choose, make sure it accurately reflects your level of certainty.