The one time I dated someone I was already friends with, it took me close to 5 months to get past that "friends" barrier. It's really difficult to redefine a pre-existing relationship, imo. So, don't feel bad. Maybe you two are putting more pressure on each other than there needs to be. You both say you're too sensitive.. but why would you change just because you're his girlfriend now? Obviously he wanted to be with you because of who you were, and not who you have turned yourself into.

My advice is to just relax. It sounds like you may be getting too uptight about something? Just be yourself.. you said you know he loves you, so what are you so worried about?

You probably need to spend less time together. Make sure you develop outside interests and stay busy - don't be attached at the hip.

Every relationship goes through this type of thing. You're out of the honeymoon period and things aren't as fun as they used to be. It's normal.
Anyhow, you sound like me. Whenever I'm in a relationship and get comfortable, I start using the guy as a shoulder to cry on. For everything. He's your boyfriend, that's what he's for, right? But at the same time maybe you're doing this a little too much. You need to toughen yourself up a bit and take care of yourself. Be more independent, go have fun on your own, then report back to him about the great time you had at the roller rink and he'll get excited too! But then your boyfriend will probably miss your vulnerable side... eh, who knows, that's his problem. Like Luisa said, you need to spend less time with each other, because your relationship is starting to sound like an especially dreary episode of Party of Five.

i've been through something similar to this before. we had such a great friendship and we were both flirty for years but timing was never quite right. in college we decided to take it further. the first month or two were great. after that he started to pull away and doing things on his own. little by little i stopped being invited out and he started making plans that didn't include me. since we had most of our friends in common I started getting questioned as to why i was never around anymore. we drifted apart and things weren't really a relationship and they just fell back into "friendship" mode. some people just aren't meant to be together. its hard to transition a friendship into a relationship and just because your friendship was great doesn't mean that the relationship will be too. you both put too much pressure on the relationship, and its not what either of you expected or wanted it to be.

i think you both need to communicate to eachother what you want, what the problems are, and if its worth continuing in a relationship.

I agree with luisamapacha and sabrinaland.

I think most of us get too comfortable in a relationship, and stop putting an effort in having a great time with our partners. Yes, it takes effort.

Think about what you used to talk about when you were friends, how you two had fun, and try to go back to that a little. Resist the urge to vent with your bf. Just focus on having fun!
Also, like luisa said, stop spending so much time together so you can miss each other, and develop other interests that don't include your bf. If you're happier and more fulfilled, you'll have a happier relationship as well.

Actually there's no reason that anything should change so much from all from all the fun you had together as friends. Even then you were sort of a couple anyway. It seems like your fights are definitely about expectations. You expected huge changes and he expected things would sort of stay the way they were. Except sex and being exclusive. You wanted lightening bolts to strike and he's taking baby steps. You thought you were jumping in a new race car and he thought you would just keep driving the Chevy you already had except with an upgrade. I would calm down and take it easy. Smile and slow way way down and try getting on the same track.