Understand that pads and tampons do the same job and they work just as well as each other. It's for that reason specifically that which one you use is entirely down to personal choice and what you're happy using.
If you've tried to insert a tampon and it's uncomfortable, it's probably because you're not doing it right, or because you're using one with too high an absorbency level for your flow, which is why it's important to match the absorbency level to your flow. It can take a bit of practice, but once you've got the hang of it, inserting one becomes as easy as putting a glove on.
As a rule of thumb, if a tampon has absorbed all it can within 4 hours of insertion, then you need to use a more absorbent tampon next time. If after 8 hours it's difficult and uncomfortable to remove the tampon and it still shows lots of white fibers, then you need to use a less absorbent tampon next time.
NB the same rules for length of time used apply to a pad too, as using one with too low an absorbency level can also cause leaks, and using one for too long can cause the blood present to break down, which can result in unpleasant B.O. developing.
Hope this helps.