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Know that in the UK, the term "college" does not mean what it means in the US. You can't get your bachelors degree at a college in the UK. You're looking for universities in the UK. I only mention this because if you say you want to go to college to someone from the UK, you could end up getting the wrong answers - college means something else there.

Normally, to get into a uni in the UK, you need more than a US high school diploma. You need that diploma plus your SAT scores, plus at least 3 AP exams, or 3 SAT II subject tests. If you don't have AP exams or SAT II exams, you can't apply to a degree course at a UK uni. Instead, you'd need to look for "foundation years" at UK unis. If you complete the foundation year, you can enter the degree course.

If you do have AP exams or SAT II tests, you can apply to UK unis for degree programs.

I can't tell you which unis are good options for you, because you haven't told me your US GPA, your SAT scores, and etc. There are unis in the UK at a variety of levels of "hard to get into". Some are very hard (Oxbridge, Bristol, UCL), some are not very hard to get into at all (Thames Valley), and most fall somewhere in the middle.