How to break through emotional barriers?

I'm currently in a 1 1/2 year relationship. I love him very much but for some reason we have this weird barrier in our relationship. I feel like my man is very shy and mirrors me a lot. We have never kissed I know that sounds weird but when ever I try to kiss him I get really nervous. He has told me he loves me and I know he is trying to use the L word often. For example whenever we say goodbye he says I love you. But for me it's hard to open up. I want to open up but for some reason I just can seem to do it. How can I break these barriers with my partner.

How to break through emotional barriers?
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