Dating is not the same as being in a relationship. Dating is what comes before a relationship. Dating is when you're getting to know someone to see if you would like to call them your boyfriend/girlfriend. Dating isn't exclusive, even if you choose not to date other people. You can't cheat when you're dating. Dating is literally taking a car for a test drive.
If you're ever uncertain of the person you're with (while you're dating), those are not definitive signs that this person isn't the one for you. Not all encounters are easy, not all encounters are comfortable. You got to give people a chance. I know that you're wondering why it should even matter, because you barely know the person, but you have to realize that people are not perfect for you. They BECOME perfect for you in time, IF they are worth your time. That's why dating can be really tricky. Now if you find out that they treat their mother terribly, or some vices that you cannot live with, then yeah, they are not the one for you. Though, I do urge you to give you everyone a shot. Looks should matter about 5% when you're dating, because you're trying to see if they have something that could compliment you in all the right ways.
We are the master of our own feelings. If you like someone, that's your feeling to own. Remember, love is a tiny seed that we plant with any romantic relationship. It needs to be nurtured to grow but it can so quickly die.
Be careful with your feelings. I see so many posts about how people are giving up and they don't want to deal with it anymore. Here's the thing people, you have to realize that not EVERYONE is the ONE. Stop focusing on the forever, and look for the right now. Have fun. Dating is actually supposed to be fun. Don't commit to anyone till you SEE commitment. If they are talking about dating 10 other people, you're probably not gonna be there one, but if you see that they text you often and they take a genuine interest in your life, that is something to consider.
As I said. Dating should be fun, but don't hold on too tightly. No one wants to feel trapped by someone they just met as much as they don't want to spend there time with someone who isn't interested. It's also not your business to know how they feel. See what happens, and give it a shot.