Short Answer:
No. You are a licensed amateur radio operator at any license class, and all classes are equally valid.
Why It Works:
Amateur radio licenses grant different operating privileges, not different levels of legitimacy. Many skilled and active operators choose to remain at a particular license level because it fits their interests and operating goals.
Important Limitation:
Some operating activities require higher license privileges, which may make upgrading beneficial depending on what you want to do.
Elmer Tip:
Upgrade when your interests expand, not because of pressure or comparisons to others.
Next Step:
Operate regularly with your current privileges and upgrade only if you find yourself limited by what you want to do.