I cannot finish with penetration

Ive used a small beginner dildo and an internal sex toy with albeit rather soft vibrations but i have not been able to finish on either of them. My ex also would finger me... i never finished on that either. It always feels good but i never actually reach orgasm unless im doing external and internal at the same time. Maybe im not doing something right or the angle is wrong? Or i need a more textured toy with harder vibes? I know some women cant finish with penetration but i want to try to get all the tips i can before disappointing myself.