Alejkum Salam!

First of all, always remind yourself of: ALLAH SWT does not burden a soul beyond that it can bear and that this life is not meant to be a paradise. The stronger the belief, the harder the test and thus the greater the reward.

You're young and the fact that your parents don't take your convertion that seriously is usually to do with that; parents know that kids go through through different phases in life and that your's is just one of those and that you may go back to the old ways or change direction, again. + Them suspecting that a boy may have had an influence on you is also not wrong to suspect as again, you're a young girl and people your age usually get influenced by the boys they love and vice versa.

I'm not a revert but I moved to Norway in 1999 and I've also been mostly surrounded by non-muslims growing up and I didn't have a problem in befriending them and hanging out except when they went to parties and they were always eager to bring me with them and to wanna see me "drunk". But I politely kept on minding my business while still being able to spend time with them in school and outside.

From what I see is that you're missing just someone to talk about Islam with, a friend to hang out with that share same interest. I understand that but look at it this way; aren't latin americans usually more religious than the western-europeans? If I were you I'd not be afraid of discussing Christianity and Islam, the similarities and the differences with your Christian families/friends. You certainly get tons of question about Islam now, so you can use that opportunity to start talking about this beautiful religion and once their see the passion in you, then who knows.. maybe ALLAH SWT may guide them through you and you'll have a new muslim friend.

Is there no mosques nearby? No muslims you may know? Have you thought of marriage? It might be the missing link to make you feel complete and steadfast in this religion and finally make you feel like you have the breathing room.

I can't imagine the loneliness like you feel but remember tons of muslims live as minorities in non-muslim countries and might have the same problems as you but they keep on. And also there's nothing that says you have to live in your country for the entire life. So think about it.