I would try with things that are easier to handle. Runner beans, pumpkin, beetroot, peas, courgettes, peppers all have seeds that are easy to plant. Buy a cheap windowsill propogator (you can get them from asda for £3), and make sure you put seed/cutting compost into it (NOT growbag compost, that has added nutrients). Sow the seed thinly, and pop in on a windowsill (peppers, courgettes, tomatoes, squash & pumpkin), for peas & beans I use the small square pots, fill them with seed compost, plant 1 seed per pot, water and bung them outside, somewhere sunny (not full sun) and out of the wind, keep them moist and forget - keep checking every week, they will germinate when ready (and you don't need to worry about hardening them off. Worked a treat last year.
Some flower seeds are bigger than others - sweet peas are the only ones I can think of, offhand as I'm more of a grow it and eat it rather than a grow it and look at it kind of person. I'm sure there will be those that like to grow flowers who can recommend others with seeds big enough to handle.
See if there is a horticultural /gardening club near you, and join it, they will be pleased to have new members join. It may be that there's something basic you're missing, or you might be using seed that's been stored badly or is out of date, and won't germinate even if you're Alan Titchmarsh!
Get yourself down to somewhere like wilko's, and get some fresh seed, seed compost and a windowsill propogator, plus some cheap pots of different sizes for when your seedlings germinate and need 'potting on'. That way you can be sure that the seeds are fresh, you are using the right 'mud' to plant them into, this will give you a better chance of succeeding and then you'll get the bug and have to join the rest of us......