Choose the weight that suits you. In fact, the most important thing in bench press is posture standard? Don't just pursue weight? Slowly increase the weight? You've been hanging around, which means it's not suitable for your current weight. 2.? Can you ask someone to help you stabilize the angle of push when you push on the bench? If you can hire a classmate with a coach to help you in the gym, that's ok.
PS: The correct force point of bench press: First, tighten the scapula and push upward to exhale (remember to clamp the chest and feel the chest force in the upward process, otherwise you can only practice your arms). Don't push your hand straight. Push your elbow a little and stop for a second. Let go of your breath slowly. Handmade? . .