I suggest you introduce yourself as a writer. Own it. Don’t be shy, just say it to someone. After some time, you’ll be comfortable. If they ask what you have written, tell them. What they really want to know is if you are published. Tell them, or if you are not yet published say, “My current work in progress it _____.”
Below find a link to an article that may help you.
http://www.authorspublish.com/how-to-know-if-youre-really-a-writer/ self-doubt is
I cannot stress enough the importance of a critique group. Gather some writers in your genre, if you cannot find a group to join. For beginning writers I recommend that group members email no more than 10 pages of their work to members of the group, no more than five members, print the work, provide written feedback on each member’s submission, and meet to discuss one another’s work. Collect the feedback and revise your work considering what was suggested.
There are times when a writer does not know what word best communicates an emotion, an action, or a description. The answer is to visit a thesaurus. There are several kind. One probably exists in your word processing software. They also come in book form and on-line. I use both. Simply type thesaurus into your search engine. For example, I wanted another word for uncomfortable. I looked it up in my thesaurus and found twenty other words ranging from painful, difficult, to unnerving. Varying your words adds flavor to your writing. Thus, I often use a Spanish word to render deeper meaning. Here is an exercise: Write two sentences with the word modern without using the word modern. Here is a link to make it easier: http://www.thesaurus.com/