I'm Alicia. Thanks for your question, I'm happy to help you today.
I can understand why you're feeling so anxious about this new relationship, especially because of your previous history and the trouble you feel like you have with trusting people. One thing I picked up on in your message is that you almost seem scared to feel happy, or at least it seems like this to me. This is probably because in the past, when you've felt happy, you've been let down or disappointed by others, so now you're telling yourself (in a sense) that feeling happy is scary. While this makes sense on a certain level, it's also counterproductive to getting what you really want. Keep in mind that you should always take it slow in the beginning of a relationship and try not let your imagination run away on it's own, even if it seems like this guy could possibly be "the one", because if you build up all these expectations in your head (that he might not be able to live up to) then you're, in a sense, only setting yourself up for disappointment. I suppose what I am saying here is that it's important to keep your feet on the ground - but it's also important to try to let yourself take a leap of faith. Sometimes, it's the only way. Try to talk to yourself rationally about this - just take it slow and see what happens. In my opinion, it's too soon for you to know for sure whether it's right or not - and I think those "funny feelings" are coming up now because you're putting so much pressure on yourself and on the relationship. Just take it easy, try to go with the flow and just have fun with him. Enjoy being together without letting your anxiety
take over. It's easier said than done, but it takes active effort on your part. Mentally stop your thoughts from running away on their own and just repeat to yourself that you're just giving this guy a chance and seeing where it leads. I might disagree with what he said, though, about you meeting someone right and then you won't feel like this. I think the chances that you feel like this are actually increased because you DO feel like he's right - so you feel like there might be more to lose, if you know what I mean :)
So just give yourself a break and try not to take things so seriously right now. Just try to enjoy spending time together, laugh, joke, have fun and just see where things lead. There's no need to work yourself up about it, and there's no need to let your past control you in the present. I know it's hard, but it's a step you need to take if you want to have a potentially happy and fulfilling relationship with him, or anyone else!
However, if you feel like it's too hard to do this on your own, you might consider talking to a counselor in person to help you through this - just so you have someone who can give you a different perspective and help you deal with the anxiety. And if your past experiences have been really traumatic, it can be helpful to talk to a professional about your feelings, especially if there's anything you feel unresolved about.
I wish you lots of luck. Please let me know if you have any additional questions. Best wishes.