Been there man..
I played in a Death metal band once, don't get me wrong I like some of the death metal music but I don't feel challenged by it and got really tired of doing simple riffs over and over again.
That's when I deceided to concentrate on my own style. I started recording lot's of stuff and ended up discovering my style.
I play metal too, still do, but a lot less. I now concentrate on different styles of music. Trying new things. I got nobody telling me I shouldn't play a fingerpicking song because we're a metal band. I do what I want, when I want.
I now take online lessons with The Jonezter to work on my weak spots. I do things for me, to reach the goals I set myself. Always remember that the most important person to satisfy in a band is you. If a band helps you reach your goal then great if not, I would leave it. Don't waste time on something that won't help or on something you don't like.
Like me you probably play music because it makes you feel good. Then why would you stay somewhere that you can't play the music that you like? Go with what you feel.
Playing by yourself is great for your creativity and freedom, but tends to be lonely at times. I'm a loner in life so for me it doesn't really bother me to be playing alone in a room. Although I really enjoy playing for someone at times. Like anything else there's a good side and a bad. You have to deceide which road you need to take to continue your musical quest. You're at a crossroad man, listen to your heart and choose your path. Only you know the anwser and only you will be able to write a song about it :)