Jungle - I Can ONLY Play Sejuani - Otherwise, it's GG - Is that weird?

New to jungling. I love Sejuani. Best of all, nobody else in unranked games even cares to ban or pick Sej. However, if I pick anybody else to jungle, I am just terrible. How do I get over this one-trick? I do play other roles but I would like to get good at jungling. And sej is amazing with CC and tanky-ness. It's the perfect combo. It's like easy mode. I tried Kayn, Hecarim, Evelynn, Elise, khazix, and... I just suck. I did okay with Chogath but nothing special. Vi is okay and I haven't tried rammus. I suck with Gragas.
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