Intercaste marriages are common now a day. Not only intercaste, in fact, but people belonging to two different religions and two different nations are also getting married. They are living a happy life. However, there are people who feel that marriage taking place between two different castes and religions is not right.
The problem here lies with your parents. Since you have told that parents of the boy that you want to get married are also okay with the whole thing. Thus, you need to convince your parents. Resistance is due to deep-rooted beliefs that have regarding the concept of marriage. To solve a problem, first, you need to understand their point of view. Once you understand their beliefs try to convince them and change their belief system.
If parents don't agree, you still can get married without their permission. Maybe they will feel bad for some time but eventually, forgive and accept the relationship. This is quite a big step but if you are truly in love and feel that the two of you are meant for each other, you can take the step. However, if you are not sure, it is not worth fighting with your parents for the same.
Don't irritate them or quarrel with them. Keep your point when they are calm. Your aim should be to talk to them and not irritate them. Try to explain to them the good qualities in your love partner that made you fall for him and why he will be the most suitable one for you. You can always give examples of intercaste or love marriages that took place in your family or surroundings. Explain how happy or successful married lives they are living.
In these cases, you always need support. Seek the support of your close friends or elderly relatives and prove your point to your parents. Introduce your parents to the boy you are in love with and ask them to decide after they meet him. Maybe their perception will change.