Hey, welcome to the forum!
I think you really need to ask yourself two questions, and be really sincere and honest answering them.
1. What do you want?
2. Why do you want that?
And this is just my reflection: your post came off as if you are itching to break up with boyfriend, and justifying this desire; while at the same time hoping to not come off sounding really superficial.
Just be honest with yourself and what you want. It won't do anyone any good to stick around under false premises. Plus, if you are eager to try something new, you may not be ready for a long term committment, and it''s better to figure this out sooner than later. I believe people who commit to marriage without getting this knocked out of their system are more likely to sow their wild oats later on.
Best of luck to you!! Keep posting and let us know how you are.