To be really at the top of your game as a guitar player, skills in the areas of lead AND rhythm guitar are what you need. In practical terms, learning the secrets of both styles of guitar is not all that hard. With lead guitar you need trills, arpeggios, string bending, and so on and with rhythm guitar(you need to be able to strum and change chords smoothly without losing your timing. If you make it your purpose in life to be a good allround guitarist, you'll find after a little time, you will actually be a great technician who can fit into any group.
And, by the way, don't be worried about being "only" a rhythm guitarist. If you have your chord changes and strumming patterns down, you'll be loved and admired by the other members of the group. The rhythm guitar player is, after all, responsible for the flow of the music. So you may not be in the spotlight like the lead guitarist, but amongst your peers you will be person of influence.
Where do you begin to learn the skills needed for lead guitar? The finger strength, the understanding of modes and scales, the secrets of
being the melodic master of the guitar? Lead Guitar Secrets