Relationship Anxiety?

Is it normal for people to get over the top anxious when in a relationship? For example, if I don't get a message response within two hours I immediately assume the person has lost interest. It's to the point where I ask the guys I date to let me know when they'll be busy so I don't get scared if they don't respond. I'm constantly afraid that people will lose interest in me and won't tell me. It gets in my head until the guy actually loses interest because of me being too scared. There have been a couple times I've actually been on the verge of a panic attack which I know is totally not normal. This usually becomes too much for me and I break up with them because of it. I haven't ever had a long term relationship because of this, and I'm starting to worry that dating isn't for me.

Relationship Anxiety?
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