Like everyone else said, the most expensive thing will always be rent. If you don mind sharing a house it’ll be around €500/month give or take a 100 on either side, then again Northside is generally cheaper. Food is expensive compared to southern European countries, but for a single person if you live alone you’ll be fine with €200/month if you have a good head for taking advantage of offers and smart about your groceries. Bills are not too bad at all, especially if you’re sharing a house, there’s four of us living in my house and the electricity bill is always around €100, that’s about €25 per person, and internet is cheap as well as mobile top-up plans. Transport is also on the costly side, you’ll be fine with €100/month to move around the city. Less if you get a bike although it is not true that Dublin is very bike friendly on the roads, cyclists are not treated with respect by cars and buses, i’ve personally witnessed countless times a bus nearly squishing a cyclist, not to mention cars beeping and cutting them off a lot. Going out is expensive depending on where you go, stick to event nights and or have the sesh at home and you’ll be grand.
If your caste is so important in your country no matter the color of your skin, the amount of money in your bank account or your looks, and that makes you think you’ll be single your whole life then I suggest you to get out of your country. Why living in in an environment that doesn’t suit your ideology or your aspirations, do you want to live and be loved in a place where caste don’t matter , go to the place where caste doesn’t matter (be warned that other factors like the ones I mentioned first still matter in the world, but why add another one to the equation). I think the most logical decision for a slave living in the south of US would be to move to other less pro-slave state or region. There are millions of other persons who don’t care at all about your caste in the world, if you’re country’s culture gives priority to castes over other factors might be holding you back from what you want to achieve in your love life, India being so populous I wouldn’t doubt there are thousands of girls who don’t give a damn about your caste. Being single is a matter if choice, so is having a partner. Be it a man or a woman, this choice is available to everyone. It’s a personal choice to live with someone throughout life or to lead life being single. Both of the situations have their own pros and cons. A person has got the freedom to analyse this pros and cons and choose what suits them the most.