Should i try for a career in the army?

I am currently doing A-levels in college and since the age of 15 i have always seriously considered a career in the armed forces, especially in the Army and the air force. As a career path in the army i would join the parachute regiment, i have told my family this and they did not seem enthusiastic at all (probably because of the paras rep & the conflict in afghan/iraq etc)....they suggested that "the RAF is better for you", so i searched the careers site and in the RAF i am considering a fast jet pilot, when i leave college i am sure i will have the right qualification requirements, but on forums and from other people etc, have said that the compitition is high and a physics/science degree is what they are looking for, so i am not getting my high hopes on that . But i feel that i have much more military knowledge in the army than the RAF and more chance of becoming airbourne. In conclusion i would like some advice on this, that would be great. so....Army (paras), RAf (pilot) or Uni?