One of the reasons I like mtn biking is that there is no such thing as a natural for this sport - you have to have good coordination, good slow and fast twitch muscle reaction and have the mental ability to lay it out where it matters.
Riding is the best way to develop these skills - best to ride with someone that is better than you. Set goals that you strive for - such as riding a climb without stopping, or a technical section without dabbing.
Yea - I got my ass kicked for the first year or two riding. I still do once in a while - but I'd like to think it is few and far between.
Just put hours in.