<human>: Relationship length: 4 years

So lately I've been going through a really stressful time. I've got a lot on my plate, and I found out that I don't respond well to having so little free/relaxation time. My boyfriend has been great in putting up with this, but a few things have been bothering me. The biggest thing is that I don't feel comfortable sharing my emotions with him. I've always been an emotionally closed off person, but his reactions to talking about feelings or the future make it even more difficult. I didn't tell him that I loved him until about 3.5 years into the relationship because I was pretty scared about how he would react. Unfortunately, his reaction was kind of awkward and negative(ish), and it still hurts thinking about it. Last month, I almost broke up with him because of this discomfort, but we talked it through and he said that he never meant to make me feel that way about talking to him. 

Last night, I was venting to him about everything that's been stressing me out lately, and that led to talking about the future.  When I asked him if he ever wanted to get married, he freaked out a bit. I realize marriage is a scary concept for some people, including me, but after being together for so long, I don't think it should send us into full on panic mode. That kind of reaction is part of what contributed to me wanting to break up earlier. Will these feelings of not being able to discuss important topics ever go away?

Could you distill the essence of the text into 1-3 sentences?
<bot>: I feel like I can't communicate serious or important issues with my boyfriend of 4 years. After this long together, will I ever be comfortable with it?