Even the pros can lose on a trade, but they make it a point not too lose so much by strictly following stop loss plans.
if you are a beginner this is normal for you, and of course you need to be sure you should experience loss for the next thing you do and you will be more intelligent
It is advise to start with a small amount, some even do demo trading but it does not give too much of an excitement.
We like to do the actual thing but as we are very optimistic we should always follow the way to be safe in trading, which is start slow with small amount.