I consider myself pretty boring because I think I'm just so reserved and kind of silent by nature, I have a good sense of humour but I'm not particularly funny, I'm not extraverted. In many respects I think E's are not dull and I's kinda are, but only on that one dimension (socially). I need the company of an extravert to really get my own energy at that same level, then I might be extremely fun to be around.
But as far as the depth of my personality goes, I don't think I'm dull at all. I have a lot going on inside, it's constant inner turmoil.
The thing is, I don't think I could get bored even if I didn't do anything. It takes a lot of time to process, contemplate and just think about things. I'm most comfortable just doing nothing really , chilling with a few close friends for example. A lot of people find it boring and I feel like I always have to defend myself for being like that, as it's seen somehow lazy or effortless by others, even though I don't think I'm those things at all.