Yeah you really should go, you have to have these teeth till the end, best to look after them the best you can. I was kinda like you, I hadn't gone to the dentist for maybe 2-3 years, and have just gone and have gotten 1 filling that had half fallen out, re-done and another new hole fixed. And was told to switch to an electric toothbrush as I was brushing away my gums (which I highly recommend, if anyone is still using the hand brushes), which is kinda irreversible and potentially really bad if it goes too far.

And there are a tonne of other things your dentist will be checking each time. Paying ~$100 a year is a small price to pay to keep your teeth healthy.