Should I join the army please help!?

I am 18 nearly 19 im 5 ft 1 and 12 st 5 pounds i want to become a nurse and im thinking about doing it with the armed forces but its a 7 year contract and im sceard of signing my life away plus i have a very close family and would miss them like crazy but at the same time they all have there own lifes im really confused HELP! lol any advise would be helpful thx abbz