This is how I read the time too. I also tend to round up to the nearest number often if precision isn’t required. Like if it’s 5:27, I’ll simply read it as 5:30.

Yes, it’s very much possible to read time with just the hour hand as currently you’re doing now. It’s a bit more difficult using smaller minutes however. My recommendation if you want be more comfortable with a two or three handed clock is to buy an analog wrist watch. Having it in practice daily cements it’s method eventually.

Read to which number the short hand points to first. Then read the long hand by counting the number of black lines that run along the sides of the circle. Going from the number 12 to 1 has 5 black lines in between. 12 to 2 has 10 lines, 12 to 6 has 30 lines, 12 to 10 has 50 lines. Check the picture attached as an example.