What do you think it is going to taste like? Maybe you've actually tasted it once before, maybe you've never tasted it and maybe you're even a little scared. Please don't be, but I understand. The unknown is always a little worrisome.
Let me tell you a little secret, there are tricks to improve the taste of cum. Don't get me wrong, it doesn't taste bad at all, but you can make it sweeter. The water I mentioned earlier doesn't hurt. Eating more fruits and veggies can make a huge difference, and I know you've heard it before, pineapple juice works wonders.
There are also different taste buds in the mouth, everyone is different, but you may find that you can't even really taste the cum in your mouth and on your tongue until you swallow it and it hits those back taste buds.
Produce for me another drop of precum, but this time place it somewhere different in your mouth and see if the taste has changed.