If you attempted to see the movie at a public location such as the cinema, or if you watched it at a friends house without your parents consent, you have broken the law.
Cinemas have the legal right to ban anybody from the premises if they try to gain access to a movie while underage.
While with your own parents is a different story. Although it's "not advised", some cinemas allow underage viewers as long as they are accompanied by a biologically-related adult. You will have to contact the cinema directly to ask what their polices are on the matter.
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It is generally recommended for individuals under the age of 15 to not watch 15-rated films, even with adult supervision. The age restriction is in place due to mature content that may not be suitable for younger audiences.
Those under the age of 15 are not legally allowed to view or purchase an age 15 certified film.