For what it's worth I think you have made a very mature decision and you should be commended for it. Well done for seeing through the marketing
. Obtaining your degree will give you lots of good experience and you shouldn't have to juggle pilot training with growing up at the same time (some people who have tried that have failed miserably).
I started pilot training at 19. On my programme the next eldest has 4 years on me. I do feel that a few more years on my side may have been a benefit to myself. It is small issues for me such as being with a group of older people on your course a few of them won't take what you're saying seriously or really give much consideration to your point of view.
Your degree sounds interesting so if it does all go tits up for whatever reason you can try to find employment in a different field.
Best of luck