All good advice above, especially Clinton's. You'll find it easier, however, to play barre chords from the G on up the neck - F at the first fret is a killer !

You might want to examine how/why you need to play barre chords. If you're playing chords that you just need to brush or strum with fingers, or a pick, or what the jazzy/swingy crowd calls "sock" chords, then you can have a slightly deadened note here & there when the forefinger is getting weak. If you're fingerpicking, and every note has to be clean and crisp, then it's a different ballgame.

For fingerpicking, I've learned how to cheat by playing partial barres or substitute chords so that the notes don't get lost as a dull thud, thud !

I heard one old guy at a fiddler's jam rant and rave about how people wanted to "turn guitars into drums with those *^%&*! barre chords, and not play open chords where you can hear the notes ring!".