Due to the nature of your posts (asking for love spell casters, etc.), people may see you as not old enough for love or that you are not willing to learn, although most do not see it this way, myself included, some may.
You are also asking for someone to cast a spell for you, this opens you up to scammers just after money or private information. Love spells are difficult for others to cast due to their personal nature, maybe instead of asking for someone to cast it for you, you could ask about what can be used to represent different items in a love spell and ideas about how to cast one and what to use.
The death threats are unacceptable but the best you can do is don't take them to heart and block the person sending them.
I hope you can find something to help you find love, but for now try to not take the scammers and "haters" to heart, you can only do so much and sometimes you can't please everyone.