Be patient 
The road to freedom has no shortcuts. Just because you can't
understand doesn't mean u forever cannot understand what the
Teachings are all about
here's one sutta to boost your confidence
http://www.accesstoinsight.org/tipitaka/sn/sn55/sn55.024.wlsh.html
Sarakaani Sutta: Sarakaani (Who Took to Drink)
[At Kapilavasthu] Now at that time Sarakaani the
Sakyan, who had died, was proclaimed by the Blessed One to be a
Stream-Winner, not subject to rebirth in states of woe, assured of
enlightenment. At this, a number of the Sakyans, whenever they met
each other or came together in company, were indignant and angry,
and said scornfully: "A fine thing, a marvelous thing! Nowadays
anyone can become a Stream-Winner, if the Blessed One has
proclaimed Sarakaani who died to be Stream-Winner... assured of
enlightenment! Why, Sarakaani failed in his training and took to
drink!"
[Mahaanaama the Sakyan reported this to the Buddha who
said:] "Mahaanaama, a lay-follower who has for a long time
taken refuge in the Buddha, the Dhamma and the Sangha — how could
he go to states of woe? [And this can be truly said of
Sarakaani the Sakyan.] How could he go to states of woe?
"Mahaanaama, take the case of a man endowed with unwavering
devotion to the Buddha, declaring 'He is the Blessed
One...,'[1] the Dhamma... the Sangha...
He is joyous and swift in wisdom, one who has gained
release.[2] By the destruction of the
cankers he has by his own realization gained the cankerless heart's
release, the release through wisdom, in this very life, and abides
in it. The man is entirely released from the hell-state, from
rebirth as an animal,[3] he is free from the realm
of hungry ghosts, fully freed from the downfall, the evil way, from
states of woe.
"Take the case of another man. He is endowed with unwavering
devotion to the Buddha... the Dhamma... the Sangha... he is joyous
and swift in wisdom but has not gained release. Having destroyed
the five lower fetters,[4] he is reborn
spontaneously[5] where he will attain
Nibbaana without returning from that world. That man is entirely
released from... states of woe.
"Take the case of another man. He is endowed with unwavering
devotion to the Buddha, the Dhamma, the Sangha. But he is not
joyous in wisdom and has not gained release. Yet by destroying
three fetters[6] and weakening lust, hatred
and delusion, he is a Once-returner, who will return once more to
this world and put an end to suffering. That man is entirely freed
from... states of woe.
"Take the case of another man. He is endowed with unwavering
devotion to the Buddha, the Dhamma, the Sangha. But he is not
joyous in wisdom and has not gained release. Yet by destroying
three fetters he is a Stream-Winner, not subject to rebirth in
states of woe, assured of enlightenment. That man is entirely
freed... from states of woe.
"Take the case of another man. He is not even endowed with
unwavering devotion to the Buddha, the Dhamma, the Sangha. He is
not joyous and swift in wisdom and has not gained release. But
perhaps he has these things: the faculty of faith, of energy, of
mindfulness, of concentration, of wisdom. And the things proclaimed
by the Tathaagata are moderately approved by him with insight. That
man does not go to the realm of hungry ghosts, to the downfall, to
the evil way, to states of woe.
"Take the case of another man. He is not even endowed with
unwavering devotion to the Buddha, the Dhamma, the Sangha. He is
not joyous and swift in wisdom and has not gained release. But he
has just these things: the faculty of faith, of energy, of
mindfulness, of concentration, of wisdom. Yet if he has merely
faith, merely affection for the Tathaagata, that man, too, does not
go to... states of woe.[7]
"Why, Mahaanaama, if these great sal trees could distinguish
what is well spoken from what is ill spoken, I would proclaim these
great sal trees to be Stream-Winners... bound for enlightenment,
how much more so then Sarakaani the Sakyan! Mahaanaama, Sarakaani
the Sakyan fulfilled the training at the time of death.'[8]
