Hi,
Everyone has doubts if they can do it or not. A ppl is an excellent start to your training, and then when you have the money gradually start doing more: hrs building, qualifications, etc, and before you know it you will have a FAPTL and be ready to get a job, in the industry you have always wanted to work in.
Although the path there will not be easy, it is possible, many people have done it, and are now in successful jobs. It may take 3-4yrs, but that is such a short period of time when you consider you will be in the industy for many more years!!
Live Your Dreams, because one day you may look back and regret you didnt.
All the best and good luck.