That I can relate to. I have shared my heart with some women in my past that only want to be friends. Rejected once again, lol
Seriously though, sharing my feelings, thoughts, emotions and opinions comes easy for me. I have found that if I keep quiet, I end up saying to myself, " what if," or " I wonder what would have happened if only "
Confidence in one's self is a key value in positive communication and help with the ability to share one's feeling or emotions.
Falling short and not getting the results u were hoping for is a fact of life, yet how we respond to set backs, tells the true character of a person. No risk, no gain.

its cant explain

Yes, love requires that and I think that's where most people are 'lacking' in the sense that they aren't really ready or willing to be vulnerable and to take that risk.
That's why I started that topic the other day "How ready are you really?"
Most people want a relationship, but not because they are ready for one, but because they don't want to be alone or can't be alone. THey think finding a partner will make them happy, while they aren't able to find happiness within.

That all links directly to not daring to be vulnerable, daring to take that risk.
If you want love and a healthy relationship, you have to be willing and able to be vulnerable. You have to be ready basically to have your heart broken. That's not what you're aiming for of course, but if your so closed off that your heart can not be broken you are also not open enough to receive love.
You simply can not keep the door closed for pain and leave it open for love. It is not possible because it is the very same door.

And by Law of Attraction, if you aren't ready, you will attract someone else who isn't ready either. If you then awkwardly express your feelings, from a mostly closed heart and with fear in your gut, they could indeed very well run away because their heart is full of fear as well.

If you are ready, really ready to receive love, you are also willing to take the risk to get hurt. It cannot be any other way. Then you will attract someone who is also ready.
If you then express your feelings, it won't be a problem, because the other is also ready and able to both express and receive feelings.

When you do that is largely dependent on the quality and quantity of dates and the need of both to express them verbally.

i agree with this. but sometimes when we know we are vulnerable we do have to watch over our actions . it is in these times that our emotions win over what is right.

No time scale, if you are both happy to date you just go with the flow until you start to feel and want to talk about a future together. I believe that one party will decide fairly quickly if the other person is not for them, a lot depends on how often they date as to how quickly it happens, but if you are still together after more than 5/6 dates the signs must be good for something more long term and it's then just a question of time.