sikh hindu relationship

Yes.
If the couple love each other, are willing to compromise and understand that being together often comes at the cost of being entirely shunned or disowned by their closest biological relatives.
It is very unlikely that parents who are very caste conscious, religious fundamentalists, cultural traditionalists or have a long family tradition of arranged marriages to relatives will ever accept the love marriage of descendants who choose spouses of a different religion.

I grew up with many children whose parents were sikhs in interfaith marriages with fellow asians of other castes, nationalities and religious backgrounds.
My mother was almost beaten to death by her father & maternal grandmother for deciding to marry an atheist, disinherited and banned from attending her father's funeral.
Her family were english ultra-traditionalist catholics that practiced arranged marriages and religious endogamy for centuries.

my parents are struggling to imagine, marrying someone from a different caste so.... depends....? Also how old are you. Cos if you are in high schl then it would be a bit stupid.

I think its possible, however I have found it to be difficult on a personal level, not due to my parents, who are too liberal imo, but from the other halfs, even when they dont come from educated backgrounds or there daughters are not doing anything extrordinary either, they seem to think they are inherently better.

So I now try to actively avoid women from asian backgrounds, not because they are unattractive, but because it is a lot of hassle which you dont deal with in English/Irish families, who are usually very friendly and upfront with you and it helps that they also enjoy drinking and football and are chilled out and not looking to nitpick every little thing lol. You can also chill out around their place and don't have to go somewhere like you do when seeing an asian girl lol

I think after a few times of this process happening, you lose the will to pursue things and try to look for other avenues as there is a sense that this is inevitable. Perhaps its different for girls from these backgrounds whose parents are more well-heeled/cultured and therefore have a bit more agency and autonomy and place less importance of what "the community" think?