You need three essential things which are:
1. MONEY (loads and loads of it)
2. SKILL/APTITUDE (quite a lot of the licence is earned through ground exams after much studying, flying tests are also hard)
3. HEALTH (you must must get yourself a class 1 medical before you go ahead with anything professional)
The 4th thing which would also help and people have already pointed out is an actual LOVE/PASSION for flying. You would be amazed how many trainees and indeed professional pilots don't actually like flying.
Personally, I would have considered my life a failure if I didn't make it as a pilot and at 30 in my first year of the job, it has been a long time coming with many sacrifices and hard work which makes it all the more satisfying. Good luck with it all. Get your PPL done first I would suggest.