Sat Sri Akaal
As said earlier, you should not talk of caste. Mentioning it shows you are also not a good practising sikh.
I can't comment upon you definition of love. Your age usually it is infatuation and love I think is usually mistaken kind of aspect in our daily life, This attraction remains until two people don't marry. What happens thereafter everyone knows.
Getting sikkhi from birth needs constant training from parents and is an investment for the community. However, parents these days for the reasons widely known, have failed to do there keep this investment up to the mark. There are many defaults at the time of maturity of this investment.
Sikhs then have not given monitored and education based freedom to there daughters, I mean they can't talk to any one including sikhs. When time comes, they then are attracted towards others and hence such situations arise.
Like I had given freedom to my daughter to talk to any person of any community but I would expect sikh as my son-in-law but educated one of her choice. This was put in her mind from the time she attained teenage. Fortunately, she got an handsome boy, educated boy of her choice and by the grace of God she is well settled. She is as good a sikh as most of the girls of today's time are. I still try to tell her about Guru Granth philosophy and pride of being part of sikh society.
Now the person you wish to marry/ or I would say you are infatuated towards each other, is ready to adopt sikhism, then
physically your parents would be able to have face saving from there Jhooty society, but adoption would mean that boy and you both will constantly study the high values of sikhism and pass it onto your next generation. Simply keeping hairs/ going to Gurudwaras and listening to our illiterate so-called preacher( excuse me ) is not suffice. But honestly chances are good enough that he would not be able to meet them.
Also what happens if shaves his hairs after wards, once infatuation period is over.
Decision is yours.