hello everyone, first post here

my name is joel and i am in a similar situation to dradam. sadly ive had a lot of personal upheaval between my teen years and now, which has played havoc with my goal of becoming a doctor.
i first decided on a medical career whilst at school. however i changed my studies at a-level to gear myself to what i hoped would be a promising career as an engineering officer in the royal marines. the subjects i studied were maths, mechanics, physics, technology and sports science (where my strengths were in anatomy, physiology, bio-chemistry, bio-mechanics, etc.). i was later to leave before my exams, planning to start afresh in different subjects. however due to personal pressures, such as being ill, and normal life pressures, i constantly had to put this on hold.
im now 26, with 2 sons, and have always studied subjects for my own interest such as biology, chemistry, anatomy etc. becoming fairly advanced especially for someone without a formal qualifiation, as these subjects have always been a passion of mine.
i am now studying for a bsc in molecular science, and would like to know if this background will affect my chances of study in the medical field? if a chemistry degree is not sufficient could you advise me what would be more appropriate. in addition to the above i am very good as learning concepts, using investigative methods, problem solving, and am of a caring and passionate disposition.
i was also thinking of studying a-levels in biology & chemistry along with the degree. the only qualifications i have are 10 gcses (4b, 6c) which although not fantastically graded, i only studied for 9/10 months rather than the usual 2 years of my gcse courses (the previous school i attended studied differently at gcse so almost all my subjects i had to do myself or else fail. i also only had the opportunity to study half of the courses (this was due to personal upsets whilst i was at school. i started half-way through year 10). however given my limitations (such as not books for english lit, not calculators for maths, both of which i gained b grades in), i do not feel i did as badly as the results themselves would suggest.
ok so... let me have it! what do you think my chances are of being accepted on a medical degree course?
thanks for your time
joel