The greatest way to make a positive first impression is to demonstrate immediately that the other person, not you, is the center of action and conversation.
Illustrating that the spotlight is on you only, will hurt you. It will allow you to miss opportunities for friendships, jobs, love relationships, networking, and sales. Show that you are other-centered, and first-time acquaintances will be eager to see you again.
Make others feel important. Stop bragging in every conversation. Being humble and listening shows character.
Recently I attended a conference. At lunch, I sat with several people I didn't know. While most of our tablemates made good impressions, one lady emerged as the person I would avoid all weekend.
She talked about herself, nonstop. Only rarely did anyone else get a chance to speak. Unfortunately, she probably thought she was captivating us with bragging but it only mad me less interested.
Sometimes, less is more. . Be inviting and be opening to get to know others. Save your resume for another time.