Have someone "watch" you so you can safely get your muscles to the point of failure. Then your scout can help you with enough weight for you to complete the move.
Having a bench press is a natural and desirable thing, so don't hesitate to ask. And if you can't find a watcher, don't miss out on any weight loss exercises that can harm you.
You can also know more about how to bench press at spcperformancelab.com.au/videos/how-to-bench-press/.
Focus more on the lower end of the lift: so many people are so concerned with getting the weight where they want it that they completely forget why they are actually lifting: to get bigger muscles!!
The more momentum you use to lift the weight, the less muscle you will use. Also, lifting heavier weights with poor form is not as good as lifting lighter weights you need to use with proper form.
Also, the eccentric (lowering) part of the exercise is actually more important than the concentric (shrink) part.
During the bottom, your muscle fibers will actually tear, allowing them to heal and grow even more. As you lift, you want to make sure that you feel a burning sensation from the muscles being directed.
If this is not possible, you may need to change your shape a bit. A common example of this is abdominal exercises. Many people tend to bend their waist instead of their midsection and end up working the hip flexors more than the abs.