No. Stars and planets only look similar when viewed without the aid of a telescope. When seen in more detail with the aid of a very large telescope, planets and stars look more similar to what they are in reality; the larger the telescope, the more detail you will see and the more the true nature of the object is revealed. Stars are, of course, huge balls of burning gases, while the composition of planets varies, some are very rocky and have little atmosphere, many have large gaseous atmospheres, and some are very hot and some are very cold. There is one star in the sky that you can see in detail without a telescope - the Sun! The Sun is actually a star, and sometimes we forget that fact because it looks so different from other stars, but primarily only because it so much closer to us than other stars.