Upvote:0
You may have been refused because your finances at home are low so they think you would want to work illegally in the UK.
I haven't seen the refusal letter so this is speculation at this point.
Upvote:5
Your cousin is not applying for the visa, you are. You need to show that you can support yourself on your own (without relying on your cousin) and have a compelling reason to leave the UK at the end of holiday - such as a job and/or a house (property) and/or a family.
Please see this excellent guide from Gayot Fow.