When you use one finger to press multiple strings, you are playing a bar chord a.k.a barre chord.

If you want to become a proficient guitarist, I recommend that you keep practicing your bar chords.
But, in the meantime you can use the alternative fingerings.

Here are some fingerings for the chords you mentioned. (E, F, B)

e--------4--------5--------2---------------------------
B--------5--------6--------4---------------------------
G--------4--------5--------4---------------------------
D--------x--------x--------x---------------------------
A--------x--------x--------x---------------------------
E--------x--------x--------x---------------------------