When you find yourself in a situation where you don't know what to do, it can be overwhelming and stressful. Luckily, there are many synonyms for this phrase that can help you express your feelings more precisely. Some alternatives to "not know what to do" include feeling lost, confused, uncertain, bewildered, perplexed, clueless, at a loss, stuck, helpless, and unsure. Each of these words conveys a slightly different nuance of not knowing what steps to take next. By using these synonyms, you can better describe your situation and seek the advice or assistance you need to move forward.