I just learned how to ride a bike. I've got turning, breaking and crossing streets down pretty well. My neighborhood is mostly flat, but there are some streets that are a bit convex and you have to bike uphill. Although I just can't seem to get all the way up the street, my legs kill out and I fall lol. I have gears, but only 1-7. Should I put the gears up? Should I just keep practicing? HELP ME!