Well, don't expect too much after five years away. It takes time to get back into it and matches aren't going to do it nearly as well as practice time on your own.
Examine your stance, bridge, cue action and eye position. Are they all exactly as you had previously trained yourself? Your old disciplines may have gone off a bit. And you're using the same cue, yes? If not, that's another likely handicap - it takes a while to get used to a strange cue, unless you're O'Sullivan. And as TC suggested, make sure that your eyes are still good or your prescription still accurate.
And lastly, tell me what club you play at and maybe I'll come along and play you for money! Ha ha.
The only way to improve is to practise. You can look on the internet for tips, but in the end it comes down to how many hours your prepared to put in on the table. If your by yourself, set the table up to recreate the shots you find hardest, be it safetys or getting out of snookers or long pots, whatever. Also, you absolutely have to think a few shots ahead. Plan where you want the white to rest after you have played the shot, even if you are thinking only one shot ahead it will massively improve your game. When you get good, you can challenge people in the pub at pool for drinks. I tend to win the first few but then with every pint, for some reason, it gets so much harder to aim.