I’ve never been able to understand competitive Smash

I’ve tried several times over the years to learn competitive smash but I’ve never ever been able to learn it. I can’t do combos because tilt attacks are so hard to do without making it a smash attack. I’ve never been able to get good timing for blocks, grabs and dodges. I watch tutorials and try it and I just can’t do it. I thought “oh I’ll just play online a lot and eventually I’ll get better” but it just kind of gets me frustrated because watching the GSP go down just makes me angry. I hate how it’s like tracking how bad I am and constantly reminding me. Is there any secret at all or am I just not cut out for it?