lol you dont suck.. just that if you jump from one character to the next and only give them one match to see if you like using them or not wont make you switch your main itll make you want to stay olimar..
but since your staying olimar for the time being, alot of do's and dont's. ^_^
dont's:
1. dont approach somethimes with olimars dtilt(even though it was like once and prob a joke)
2. dont always be the one to approach spacing and spamming iz key (i was able to read when you would approach and hit you with a neutral air)
3. ^^^ spam untill your opponent approaches you. you can approach but dont make it a habit. and make sure you can read them when they start approaching you every time, so you can get some hits in by their approach.
4. olimar is a spammer, like ive just stated^^^, he can outspam alot of characters and rack up the percentage the fastest in the game, use his pikmin!!!
5. olimar has hands down the best grab in the game, after getting your average olimar combo( neutral air, to up smash, to up air) read them when they come down(it doesnt take much skill since olimar has a huge grab range) and run to the side(either, usually right works best) and reverse grab.
6. thats just a lil thing you can do, but thats not the only time i telling you to grab, spam his grab up close and land some smash attacks in when you can.
7. ^^^ again like ive stated olimar also have some of the best smash attacks in the game, use them!
8. olimar is just three things: his grab, smash attacks, and pikmin spam... and some other arials to lead to combos.. but those are the main things you want to put into your game plan. ^_^
those are just some things that come to mind instamtly.. if we play more (which i know we will, and soon) then ill try and find some more problems or areas of improvment for ya budz! ^_^