What you're describing is common and usually treatable, but the barrier feeling and pain need an in-person exam to pin down the cause.
Next Steps
Please book a gynaecologist visit for a pelvic exam. It can quickly show if this is muscle tightness, dryness, or something else.
Health Tips
You can try a water-based lubricant in the meantime, but avoid pushing through the pain since that can make it worse.