Get a moped that can keep up with traffic, a lot safer that way. If you are 16 restricted at 30mph, derestrict the bike. 100% worth the risk. Best advice is to always pay attention on the road. You will need to be quick to think and aware of other drivers and then you will be fine. Most accidents are from drivers not seeing you so I'd recommend a colourful bike, clothing or helmet to stand out. In the end, death is inevitable if you ride or not. Put it this way, I'd rather die doing what I love, than die being miserable. Once you ride a few times you will feel more comfortable. If you are nervous on your first ride, ride with someone you know and it will put you at ease because you won't feel alone on the road.