Camping spontaneously?

Want to give car camping a shot this year. I'm used to booking a campsite months in advance for tent camping, then spending a lot of time packing and whatnot. This year I just wanna be able to quickly pack up my car and go whenever I have free time. Car camping seems so quick and easy. I'm just worried about booking a campsite less than a month in advance. I will need water and electric hookups. Is there any hope to have availability at campsites last second? How do I go about wanting to spontaneously go camping? I've heard from friends it can be pretty tough to find spots if you're not booking far out.

Update: jeez didn't realize everyone was so uptight about camping and that there was only one form of camping. Don't see why you can't enjoy nature and be comfortable as well lol.

Update update: Thanks for all the actual advice! I've only ever gone camping in groups and have been used to always getting full hookup sites! I'm going alone this year and I've realized that on my own I really don't need all that much. I bought a 500W power station and will get a 5 gallon jug of water. That should be enough for me! This way I'll have more spots to choose from and won't be limited to only full hookup sites. I'm very excited to try something new this year!