Former Registrar here.
Except in very specific and rare circumstances which do not sound as if they apply here, both of you have to attend to give notice of marriage at the Registration Office in advance of the marriage. If one of you is not a UK citizen then additional procedures at a regional office would have to take place.
During the giving of notice both parties will be interviewed separately, about both their own and their fiance(e)’ s details. This is in large part to determine that the couple are genuine, know each other, are genuinely wishing to marry (ie it is not a sham marriage for immigration purposes) and it is not a forced marriage.
Did you attend this appointment and give notice? This is key.
Both parties should then always be interviewed separately before the ceremony to check their legal details, check there have been no changes to their details since they have notice( eg a change of address, have they had a birthday etc so their age has changed). During this process the registrars will try and place the couple at their ease, but they will also be very alert for any sign that a party to the marriage is being forced into it, or that eg they may not have sufficient English language skills to understand the nature of the undertakings they are about to make, in which case an interpreter may be required.
The Registration service are extremely hot on the subjects of both forced and sham marriage. That is not to say they can never take place, but every effort is made to make it as difficult as possible.
These are occasions upon which anyone being forced into marriage
can state this and ask for assistance. As a Registrar I would have instantly refused to marry anybody who asked for my help in these circumstances and given them my full protection/ called the police etc without a moment’s hesitation, and I’m sure my colleagues would have done the same. Apart from anything else the registrars have a huge legal responsibility when conducting the ceremony, and continuing with a marriage in these circumstances would have massive repercussions for them personally.
You need to ask yourself what happened in your case. Were you subjected to threats, violence, domestic, emotional or financial abuse of any kind? Did you attend to give notice? Did you know the wedding was taking place in advance or was it sprung upon you?
Unless you are withholding some major pieces of information it doesn’t sound like a forced marriage, more a reluctant marriage you are now regretting, but you know more than I do what went on.
Divorce is always an option for you. Perhaps a chat with your local registrars would help clarify your thoughts.