Keep Interviewing?

If you cut yourself out of the running now, there's a 100% certainty you won't end up in the job. 

If you're not good at the sales part, see what mentoring programs they have in place for you to take advantage of.  Talk to them about what training or seminars they'll send you to. 

I hate selling but the fact is that if you make enough contacts (have enough conversations with a large enough number of people), you'll sell.  More often than not, when it comes to insurance sales, it's a matter of price that makes the sale for you.  If this company can't compete on prices, you wouldn't make much sales even if you were the best in the business. 

When it comes to insurance, as well, you have a bit of wiggle room with the prices you quote someone.  If the prospect balks at the premium, bump up the deductible and/or drop the coverage level a little bit to make the price more attractive.  (Tell them, of course, that this is how you're reaching that new figure because you're not trying to deceive them about the coverage levels you'd be providing them.)  Selling insurance is probably one of the easier things to sell because your hands are essentially tied on the prices.  Those prices come from actuarial tables from The Mother Ship of the insurance company so there's no haggling to really be done - like a used car salesman or a door-to-door vacuum salesman!  Insurance sales is mostly about developing the personal relationship (finding out what's important to them & playing to that) and sharing information (here's what this coverage costs). 

You don't have to be flashy or terribly schmoozy.  Just pleasant, organized and knowledgeable about your company's products. 

That said, I would definitely continue interviewing if only for the practice!  Who knows - they may end up making you an offer that "you just can't refuse!" 

In the six years I've been with my current employer, I've interviewed at least twice a year for other jobs just to keep my skills fresh and ready to go.  When I recently interviewed for the newest position (about 6 mos ago), I rocked every single interview because I was very well prepared and I felt extremely comfortable with the questions they asked & the answers I was giving. 

Besides, you don't get to decide for the recruiter what's a waste of their time!  It's their decision to make, not yours.  And you never know - they might find out something about you in that next interview that gets your lined up for a completely different job that you'd be absolutely perfect for.  If you quit interviewing now, you're arbitrarily limiting your choices and closing doors that you can't even know exist just yet. 

My advice: Stick it out and do your best.  Good luck, whatever you decide!