Your best option is to try and create your own opportunities. You can give presentations to your friends, colleagues, family members and anyone else who wants to listen. You may also want to join public speaking clubs in your area, like Toastmasters. These groups may be able to help you become better at giving presentations in general. If you feel like you don’t get any opportunities to practice, it may just be that you haven’t looked around and found the audience members who would be interested in hearing your presentations.