I’m a 19 yo F. I don’t know if this is splitting. Well maybe it is idk. But basically I’ll look at my boyfriend and be like do I love you? Like am I feeling in love with you right now ? Why am I with you? Is this love? Is this how this emotion is meant to feel? I get the same way with happiness.  I’ll be having fun with my friends at a party, I start to wonder am I happy? Is this actually fun? Is this all? Is this happiness? Is this as good as life gets? 
It’s weird. Is there a name for this? Or reason? Then just get a blank feeling. I’m not sad. I’m not happy. I’m just blank. Like I don’t know what I feel. And you’d think it would be nice to like at least not be sad or angry or manic; but it’s so unsettling being in that emotional purgatory.