I'm a primary teacher and I love my job. It's the only job I ever wanted to do and I trained pretty much straight from sixth form, have been "in" for 13 years now.
I could list many, many negative things about the job. And it differs from school to school. I consider myself lucky to be in a fab little school and to have a permanent part time post.
I've known quite a few people enter teaching later and not many of them lasted long. I think the people still teaching now are either young and have lots of time and energy, older and well paid who can't afford to leave, or, people who are in lovely schools not experiencing some of the worst of what is happening at the moment.
What is it about teaching you think you'd like?
Can you afford to train for 4 years to earn a pretty modest salary? The removal of the pay scales and the introduction of performance related pay mean there is no guarantee of earning more as you gain experience.
If you do decide to train, consider doing a separate degree in something that would be otherwise useful, then doing a pgce, these are fine for primary as well as secondary. I did a 4 years honours teaching degree and now find myself untrained for anything else. I'm currently training as an accounting technician alongside my part time teaching post as I don't want to teach forever.
Also make sure you spend some time in schools volunteering, try and get into whole class sessions, not just one to one or small groups...