I've been in this situation when I first started out. There are opportunities if you make them. Some really good things to do include these:
- Play at your high school. Organise a lunch time concert, for example, or an end-of-year shindig for your class. Best if you can use the schools gym or auditorium. Make it a charity or fundraising event to sweeten the deal with those in charge at the school.
- Enter competitions like a Battle Of The Bands. If there is none, but you know at least four or five bands around the town, see if you can work together to organise your own competition. This is also something that the school could help with, and could also be presented as a fundraising opportunity.
- Again, if you know a few bands, see if you can work together with a youth or community services group to put together a concert aimed at underage people.
- If you know a friend with a big backyard or garage, organise a party (but do it responsibly) and do a short set for your friends. This is a great way to get practice in, impress the opposite sex, and get some experience in a live situation. It also makes for an awesome Saturday afternoon/evening with friends.
- Record a simple demo, get it into the hands of your friends, and especially get it on the internet. Make accounts on social networking sites to start gathering a fan base beyond the people you personally know.
- Depending on your style, you could set up anywhere (a park, skatepark, outside a mall, on the street) with acoustic instruments and bang a few tunes out and see if people notice you. It's a good way to strike up conversations with people who could help you get a gig.
I'd also like to add to that that you need to be careful of having too-high expectations. Let's face it, it's hard to get good gigs with a band when you're still in your teens - most places that have regular bands are bars and pubs. There is also a lack of community support for the arts, and particularly for creative young people. So you need to make your own opportunities, as I mentioned above.
You also need to know how to make a negative into a positive. My first band were together for years and we played for people maybe five times. We were so focused on getting cover gigs that we didn't really stop to take a different approach. What we should have done is accepted that there are not enough gigs for people our age, and therefore we should commit our time and energy to becoming technically proficient musicians and to working hard at writing good original music together.