The Direct Answer is no
You'll need at least £50k to get what you need, and this is a lot of money whoever you are.
You'll need either a big loan from someone or a well paid job to allow you to save up. The option of borrowing from a bank on the risk of getting an airline job at the end which would allow you to pay off the loan is no longer viable. So a poor man can not become as professional pilot, and it remains an elitest profession. If someone ever researched this they would find that airline pilots largely come from middle class backgrounds, and many integrated students are bankrolled by daddy. There's simply no other legal way is your around 20 years old.
However as has already been said, if you set your sights on it and gear everything you do towards it, it can be done.