You will either file as Other Income with the form 8919 or you will file a sch C.
You worked for money and must pay federal, Medicare and Social Security taxes. If it was not paid on a w2, you are considered self-employed. As an internship, I would have to question how that could be based on the rules of employee or contractor.
See Understanding Employee vs. Contractor Designation. which states:
Workers who believe an employer improperly classified them as independent contractors can use Form 8919 to figure and report the employee’s share of uncollected Social Security and Medicare taxes due on their compensation.
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