Teacher of 26 years here. 25 in state secondary. The last I would say, 8-10 years have been incredibly tough for us all.
You do make a difference. Some students will remember you for ever and you really can change lives. It can be lots of fun, you learn loads, and work colleagues can become really good friends.
The workload is never ending, and the mental load can be incredibly heavy. Teaching skills, getting experienced, good subject knowledge and strong behaviour management are key. You will need good support systems in and out of school, and huge resilience to mitigate against it all. The holidays are when you crash and burn, and usually get ill...
I would say, do the training, see how you get on. You might love it, you might bear it for a while, you might really hate it, but you wont know unless you try.
As someone else upthread said, do not expect it to be for life, most young teachers leave within 5 years. You will gain bags of life experience and transferable skills though!
Good luck.
We do need good young teachers in schools!