Not true. Firstly, we don’t decide anything at EU level unless all member countries have explicitly agreed by treaty to do so — and even then, each piece of legislation is agreed by national governments. For sensitive matters like tax and foreign affairs, the requirement for this agreement is complete unanimity, and in other areas, there is a very high ‘qualified majority’ threshold. Evidence
As a former Conservative UK minister admits, “It is very hard to find an EU regulation of significance that has been forced on an unwilling British minister who voted against it”! Evidence
For very detailed analysis of the data on the UK’s role in EU decision-making, read this series of essays by Professor Simon Hix, published in the Guardian.