I agree with the above.
For an applicant from India (or Pakistan, and some other countries) the visa officers expect a traditional relationship. So a couple with an arranged marriage who have a huge, traditional ceremony will often be accepted more easily than a couple with a relationship based on love.
However, because you have known each other so long, and have been in a relationship so long, you should be able to provide enough proof your relationship is genuine to be accepted even without the traditional ceremonies.
In your application, provide a lot of proof of the history of your relationship. Explain that it is a love match, and explain why the family does not approve and why they weren't at the wedding. It is better to explain things up front than to have the visa officer wondering.
When you do get married, even if it is a simple civil wedding, make it look as special as possible. Don't say you didn't have a wedding - your court wedding is your wedding. Get dressed up, have flowers, exchange rings, whatever seems right to you. Have some kind of reception, even if it is only dinner at a restaurant afterwards. Having family members there will help. Even if the parents don't approve, maybe there are other relatives who do. Go on a honeymoon. And document all this - lots of photos, receipts for anything wedding-related, a list or photos of any gifts, etc.