You never know if you can get the job unless you try, right? The more applications you send out the better; even if you are under-qualified, job postings often list the employer's "dream qualifications"...they many times will accept people who don't meet all of the criteria.
Now for the interview, you do need to at least appear confident, even if you're shaking inside! Practice some questions they may ask, get a friend to do a mock interview with you. The more you prepare, the more easily you'll be able to answer their questions.