I'm a physics student from Europe and planning to apply to a us grad school next year. I have been skimming through a lot of profiles in the last few days and noticed one thing: Many of you seem to have a lot of "research experience" - which is kind of surprising to me

Seriously, I think I can say with some confidence that I really worked my ass off in the last 4 years, but I never even got close to being able to do any original research in the field I'm interested in. (Mainly HEP-theory and cosmology)
Another reason is that our university system doesn't really support people who want to do summer research - it's just an issue of term dates etc.
So far, the only thing I have been doing that was at least going into the direction of "research" was my bachelor thesis, and until the end of next year, I will have finished a 12-month master thesis. But still, I don't really expect to contribute to the solution of the great mysteries of our times in that work...
So, my question is: Should I wait another year after finishing my masters degree, do something I would really call research, and then apply to grad school? Or should I be more confident? Or are some people just exaggerating a bit in their profiles?
Don't get me wrong, I accept that some people out there simply are geniuses with publications in phys.rev. etc. but I'm talking about the average grad school applicant...
I do understand, however, that the situation is different in experimental physics - I guess it's possible (and advisable) to spend some time in a lab during your early years of study.
Thanks for your help!