Being a "jack of all trades" sucks

I've tried countless sports, activities and hobbies over the years. Usually I hyperfixate on something for a week to severall months depending on what it is. For example my current hyperfixation is climbing (indoor bouldering). Ive been going for a month so far, and I know no matter how much I think I love it at some point my brain will just go "yeah I dont like this no more". And so I NEVER get REALLY GOOD at something and it's annoying! Most people I know try some activities and stick to one, which means they have time to get good at it. Meanwhile Im half decent at a lot and really good at none. This also applies to jobs but since Im starting college I havent had many experiences yet. Any advice ?