How can I restart my education and career in America?

I have recently completed a two year BTEC level 3 extended diploma in wildlife conservation and find myself with no direction in life. This is due to jobs in that area being very sparse with the jobs that are available being incredibly specialist that require many years of experience to even be considered.

My dad was the main influence for my passion in wildlife conservation and the reason I planned to study it at college after high school. During my last year of high school my dad passed away. This was a very bad time in my life and greatly destroyed my motivation when revising for my GCSEs exams and completing for a BTEC level 2 in animal care that I was also completing.

I managed to scrape by and achieve a pass in level 2 animal care and the GCSEs I needed to get into college. I decided to continue with my plans of studying wildlife conservation. However by the end of the first year I had completely lost all interest in what I was studying and the future it would provide. I decided to stick it out another year and just go for passes because I didn’t want the first year to have been a complete waste of time with nothing to show for it.

I feel I have changed a lot as a person since high school and regret wasting two years on qualification that I will probably never use. So basically I want to restart my career path, study something I actually enjoy and a have stable future career.

I am half English and half American but have lived my whole life in the UK. I desperately want to move to America and attend college over there rather than going to university in the UK. I have finally made my mind up for sure and have decided that I want to study computer science but the qualifications I already have aren't really related and may not be taken seriously. So I was wondering what I would have to do in order to get into an American college and study computer science?

I've heard five GCSEs along with two years of college or A levels are equivalent to an American high school diploma? Would a G.E.D be enough? Could I spend some time attaining the qualifications needed to apply for computer science?

Also I wouldn't need to get a visa and I would be eligible for student finance because I am legally an American citizen.

Any help on the topic would be greatly appreciated!