Hi, 14 weeks is still very young, your pup is very much still a baby. Setting boundaries is important but remember he is still a baby and needs lots of attention and love.
I am sure there are plenty that would disagree with me but I am not a fan of crate training (sorry folks). The puppy does need a "safe place" and to learn that there are times when he needs to be on his own but this should be for very short periods to begin with. But you have to decide what is best for you, your family and your home.
If there are areas of the house that you think should be "out of bounds" then you need to make sure this is unavailable to him rather than keep telling him off. For example a stair gate is good if you don't want him upstairs.
Remember you are his security it is natural he will want to be with you all the time to begin with. Puppies are naturally curious, playful and mischievous with patience and time I am sure you will work it out together.
There is plenty of help and good advice on this website so hang in there and enjoy your baby!