...my parents would kill me if they knew I was having sex...not an exaggeration..
If this really is not an exaggeration you need to go to the Police. In the UK you would have Autonomy as a person in your own right
Seems to me you are trying to please everyone ignoring your own rights. Firstly your boyfriend, if he cares, will understand if you don't go, he should stand by you, if he does not then you have the wrong man. So, you could not go and get your self some thinking time.
You do need to stand up for yourself, not by having the loudest voice, but by simply acting as an autonomous being.
After being under these pressures for some time its easy to obey to placate (the essence of cult control). There are women's groups for people in your situation, all over, some are Asian groups. Talk to helplines gets some addresses. You might get counselling via your Dr too.
Read up about autonomy, womens rights, and the Stockholm syndrome.
Remember, you are a wonderful creation in your own right, anyone that does not see this does not know you